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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

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Corporate seal - corner seal

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Address stamp / check stamp

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General rubber stamps and data stamps

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Corporate seal discount seal

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Bank seal, personal seal, correction seal

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Registered seal

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Office Supplies Handheld Stamp "Direct Simple Hand Stamp"

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Seal Negative Film Printing System

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

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Hyper CLT flooring panel

CLT flooring boards that can also be used in material yards | Hyper CLT flooring boards

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In a civil engineering site material yard, not only is material storage conducted, but also the frequent movement of trucks and heavy machinery, unloading, and the movement of workers. On unpaved ground, mud and ruts can occur due to rain, which may reduce work efficiency. Hyper CLT mats are civil engineering CLT materials that utilize wood CLT. By laying them in material yards or storage areas, a work space that facilitates the movement of vehicles and heavy machinery can be established while protecting the ground. They can be laid only in necessary locations, and relocation or repurposing in accordance with construction progress is also possible. The 5×10 panel weighs approximately 230 kg, and the 5×20 panel weighs about 460 kg, making them lightweight and easy to install and remove even with small machinery. After use, they can also be utilized as temporary roads, access routes, or heavy machinery work yards. Additionally, they offer unique benefits of wood, such as glare reduction, noise suppression, and CO2 fixation. As a registered technology with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS "TH-250021-A," these wooden mats can also be used for environmental improvement in material yards and innovative public works.

Aug 20, 2026

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AAEON UP Series Board for Embedded Applications with Intel Core Processor (Series 3) [UP WCL]

  • NEW
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Features: ● Equipped with Intel Core Processor (Series 3) ● Onboard LPDDR5 memory: up to 24GB ● Onboard UFS storage: up to 256GB ● 2.5GbE (2.5 Gigabit Ethernet): 1 port ● HDMI 2.1 (TMDS): 1 port ● USB 3.2 Type-A: 3 ports ● 10-pin GPIO: 1 port ● Power input: 12V DC * This model does not include an operating system.

Aug 20, 2026

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AAEON UP Series AI Development Board with Intel Core Series 3【UP Nexus WCL】

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Features: ●CPU: Intel Core Processor (Series 3) ●Onboard Memory: Onboard LPDDR5 (up to 48GB) ●Onboard Storage: Onboard UFS (up to 256GB) ●LAN: 2.5GbE ×2 (Intel Ethernet Controller I226-IT) ●USB: USB 3.2 Type-A ×2, USB 3.2 Gen 2x2 Type-C ×1 ●GPIO: 40-pin GPIO ×1 ●Video Output: HDMI 2.1 (TMDS) ×2, DP 1.4a (via USB Type-C) ●Serial Port: RS-232/422/485 (10-pin header) ×2 ●Expansion Slots: M.2 2230 E-Key ×1, M.2 2280 M-Key ×1, M.2 2242 M-Key ×1 ●Security: TPM 2.0 ●Power Input: DC 12–24V input

Aug 20, 2026

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AAEON UP Series Edge PC equipped with Intel Core Series 3 [UP Nexus WCL Edge]

  • NEW
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Features: ● Equipped with Intel Core Processor (Series 3) ● Onboard LPDDR5 memory: up to 48GB ● Onboard UFS storage: up to 256GB ● 2.5GbE (Intel Ethernet Controller I226-IT): 2 ports ● USB 3.2 Type-A: 2 ports ● USB 3.2 Gen 2x2 Type-C: 1 port ● 40-pin GPIO: 1 port ● HDMI 2.1 (TMDS): 2 ports ● DisplayPort 1.4a: via USB Type-C ×1 ● RS-232/422/485 serial ports: 2 ports ● M.2 2230 E-Key: 1 slot ● M.2 2280 M-Key: 1 slot ● M.2 2242 M-Key: 1 slot ● Equipped with TPM 2.0 (Trusted Platform Module) ● Input power: DC 12–24V * This is a model without an operating system.

Aug 20, 2026

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

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  • PRODUCT

Metal cracks are one of the concerns in equipment maintenance operations. Conventional welding repair methods can alter the base material around the crack due to heat, leading to residual stress and deformation, which always carries the risk of "crack recurrence" or "secondary damage." Hinode Water Supply Equipment Co., Ltd.'s "Mechanical Stitching Method" is a new technique that allows for metal crack repair without the application of heat. By using special bolts and reinforcement plates, the crack is physically removed without affecting the base material at all. Repairs can be made 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.

Aug 20, 2026

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