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  3.   誠  文  堂
  4. I made a pi stamp.
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  • Nov 22, 2024
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Nov 22, 2024

I made a pi stamp.

  誠   文  堂   誠  文  堂
At one point, there was a lot of talk on "X" and online news about a certain stamp shop in Shimane Prefecture that carved the value of pi into their stamps. If I remember correctly, it was also featured on television... I apologize for bringing up a personal matter, but my wife, who is from Shimane Prefecture, was very pleased with this news. However, gradually, my artisan spirit began to ignite... I also tried my hand at carving. Could I carve something even better than the stamp shop in Shimane? φ15, φ18, φ21... which material should I carve on? What should I carve? After much deliberation, I decided to try to carve as much of pi as possible. I thought, "Let's try carving a rather long sentence like 'Seibundo's high-precision rubber relief printing has been built on over half a century of unique research and development since its founding in 1948...'" I did it. I would be happy if you could take a look when you have some free time. The PDF document of the pi stamp might be easier to read. By the way, our company can also carve letters as small as 0.5mm into molds, so we can create rubber stamps that are 0.5mm in size as well. Tomorrow is "Labor Thanksgiving Day," a holiday. Let's both do our best today. Thank you very much.
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円周率ハンコ.pdf[192719]

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This is the page for registered seals.
We can create various types of seals such as registered seals, bank seals, personal seals, corporate seals, and address seals, so please feel free to contact us.

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Corporate seal, company seal

Corporate seal, company seal

The company seal is an important stamp that represents the authority and symbol of a company or organization. It is used on contracts, receipts, and other general documents for corporations and organizations.

  • Marking machine

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Corporate seal, representative seal

Corporate seal, representative seal

The representative seal is an essential stamp for the registration of company establishment. It is a legally important corporate seal that proves social credibility and authority. It is a significant stamp registered with the Legal Affairs Bureau, accompanied by legal authority and obligations.

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Corporate seal discount seal

Corporate seal discount seal

The seal is stamped across two documents for important documents, stock certificates, etc., at the time of the contract. It serves as evidence for estimates, bids, contracts, and so on.

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Address stamp / check stamp

Address seal and check seal

■General seals and rubber stamps will be provided according to your requests. ■For corporate clients such as companies and schools, we offer special pricing and significant cost reductions. ■We handle various manufacturers for date stamps, rotary stamps, subject stamps, computer subject stamps, etc. Please request a quote first.

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Seal or official seal

Seal (or official seal)

A registered seal is the most important type of seal and is associated with the establishment of legal and social rights and obligations. It is a seal that is registered at the municipal office and for which a seal certificate is obtained. Generally, it includes the person's name. It is used for contract documents, real estate registration and sales such as land and buildings, and vehicle registration, among other purposes.

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Bank seal, personal seal, correction seal

Bank seal, personal seal, correction seal

"Bank seal" The bank seal, also known as the treasure seal, is an important stamp used for financial transactions, such as time deposits, transfer deposits, and postal savings. "Personal seal" The personal seal is commonly used for general office work (such as invoices, attendance records, and simple monetary receipts) and is a stamp that is always carried for the purpose of stamping.

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General rubber stamp (Techno Touch data stamp)

General rubber stamp (Techno Touch data stamp)

■We will respond to your requests for general seals and rubber stamps. ■For corporate clients such as companies and schools, we offer special pricing and further significant cost reductions. ■We handle various manufacturers for date stamps, rotary stamps, subject stamps, computer subject stamps, etc. Please request a quote first.

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Modular connected rubber stamp (minimum character size 0.5mm)

Modular connection rubber stamp (minimum character size 0.5mm!!)

Reconfigurable linked rubber stamp (it has a handle). Because the tip is narrow, it can be used to stamp areas that are typically inaccessible to regular rubber stamps, such as gaps in products.

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Hand-operated stamp "Direct Simple Hand Stamp" demo machine available for free rental.

Direct Simple Hand Stamp

This is a manual type simple hand stamp. You can freely choose the font, size of the characters, pitch, and more. The ink pad is built into the main body, making it ideal for continuous stamping.

  • Office supplies and stationery

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Seal Negative Film Printing System

This is a negative film printing system that uses commercially available inkjet printers (specified models) as a replacement for the existing plate-making system.

With the recent spread of digital cameras, film and opaque materials for the seal industry are disappearing. In fact, matte film has vanished from this industry. Those who have been using the previous system have made tremendous efforts to adapt, but this system does not require any darkroom, camera, film, developing solution, fixing solution, opaque materials, etc., unlike traditional systems. There is also no need for the technique of developing film. Additionally, film, developing solution, and fixing solution must be treated as industrial waste when disposed of, but this system produces no industrial waste at all, and everything can be disposed of as combustible waste without any issues.

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Related catalog(13)

Corporate seal, representative seal

Corporate seal, representative seal

PRODUCT
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Corporate seal - corner seal

Corporate seal - corner seal

PRODUCT
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Address stamp / check stamp

Address stamp / check stamp

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General rubber stamps and data stamps

General rubber stamps and data stamps

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Corporate seal discount seal

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Bank seal, personal seal, correction seal

Bank seal, personal seal, correction seal

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Registered seal

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Office Supplies Handheld Stamp "Direct Simple Hand Stamp"

Office Supplies Handheld Stamp "Direct Simple Hand Stamp"

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Eternal Ink (STAMP INK) - Catalog

Eternal Ink (STAMP INK) - Catalog

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Modular stamp with interchangeable components

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Seal Negative Film Printing System

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Office Supplies Seibundo Co., Ltd. Comprehensive Catalog of Marking Stamps

Office Supplies Seibundo Co., Ltd. Comprehensive Catalog of Marking Stamps

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CCS3 product photo

The new product "Vehicle Count Sensor CCS3" enables efficient occupancy management of large parking lots.

  • NEW
  • PRODUCT

Hotron Inc. has launched its new product, the "Vehicle Count Sensor CCS3"! This product is a ceiling-mounted sensor that combines infrared and radar technology. It reliably detects vehicles in both directions with a single unit, accommodating traffic during congestion and vehicle passing, thus achieving efficient occupancy management in large parking lots. Additionally, it can be utilized for exit warning purposes in addition to vehicle counting, contributing to the safe and smooth operation of parking facilities. 'Features' - Improved detection performance against changes in road surface during rainy weather by using both infrared and radar. - Equipped with IP67 waterproof and dustproof performance, making it effective even in salt damage areas. - Various settings can be configured from a dedicated app (for Android devices), with current settings easily understandable at a glance. - The base dimensions are the same as the previous model "CCS2," allowing for smooth replacement of existing equipment. *For more details, please refer to the product information, catalog download, or contact us.*

Oct 09, 2026

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Hyper CLT flooring panel

On September 15, we issued a press release for the hyper CLT flooring.

  • NEW
  • PRODUCT

On September 15, 2026, we issued a press release regarding the wooden lightweight sheet "Hyper CLT Sheet." The Hyper CLT Sheet is a civil engineering sheet that utilizes CLT (Cross-Laminated Timber) stacked in an orthogonal direction. It can be used in various locations such as temporary roads, access routes, heavy machinery work yards, and material storage areas. The 5×10 version weighs approximately 230 kg, making it relatively lightweight and easy to install, remove, and relocate. Additionally, it offers environmental benefits such as reducing glare and metallic sounds typical of wood, as well as CO2 fixation. Furthermore, it can be proposed for the use of new technologies in public works as a **registered technology with the Ministry of Land, Infrastructure, Transport and Tourism "TH-250021-A."** Through this press release, we aim to expand the new wooden lightweight sheet that combines wood, NETIS, civil engineering, and CLT to more construction sites.

Oct 09, 2026

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Casting sand mold 3D printer prototype production

  • NEW
  • COMPANY

● The production time for cast prototypes can be shortened! Since model making is not required, the production time for prototypes, which previously took about a month, can be significantly reduced. ● Model costs can be reduced! By directly producing sand molds from 3D data, there is no need for model production costs. If changes to the model are necessary, they can be addressed by modifying the 3D data. ● Similar products with different shapes and dimensions can be prototyped simultaneously! Different products, such as similar shapes or varying dimensions, can be molded at the same time in one molding process. This allows for the verification of multiple types in a short period.

Oct 09, 2026

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Non-contact light beam touch sensor "HA-T Series"

【Catalog now available!】Energy-saving automatic door sensors "HA-T401/HA-T520"

  • NEW
  • CATALOG

The "HA-T Series" is an energy-saving automatic door sensor that opens only for those who wish to enter, whether on a busy street or in a narrow passageway. The automatic door opens simply by bringing your hand close, addressing hygiene concerns even in facilities used by a large number of people. You can choose between "Non-vision Mount Type/HA-T401" and "Non-vision Built-in Type/HA-T520" depending on the application and installation location. 【Recommended for such places!】 ☑ Entrance facing a busy corridor ☑ Presence of counters or signs near the door ☑ Buildings facing narrow passages ☑ Buildings that prioritize aesthetics ☑ Hospitals and facilities that consider hygiene ☑ Large facilities with many doors 【Features】 ● Adaptable to various door types with four detection spot settings ● Reduces unnecessary opening and closing, contributing to energy-saving by minimizing wasteful power consumption ● Equipped with a light touch function, allowing the door to open and close just by waving your hand, ensuring hygiene ● Can also be used as a wide detection range non-vision infrared sensor ◎ For more details, please download the materials or contact us.

Oct 08, 2026

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Metal Crack Repair: MS Method for Repairing Cracks and Fractures in Machinery Equipment

  • NEW
  • PRODUCT

Metal cracks are one of the concerns in equipment maintenance operations. Repairs using conventional welding methods often change the base material around the crack due to heat, leading to residual stress and deformation, which constantly carries the risk of "crack recurrence" and "secondary damage." Hinode Waterworks Equipment Co., Ltd.'s "Mechanical Stitching Method" is a new technique that allows for the repair of metal cracks without applying heat. By using special bolts and reinforcement plates, the crack is physically removed without affecting the base material at all. Repairs can be carried out even in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. For more details, please contact us or download the catalog.

Oct 08, 2026

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