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  3.   誠  文  堂
  4. I made a pi stamp.
PRODUCT
  • 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

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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Office Supplies Handheld Stamp "Direct Simple Hand Stamp"

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

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Hyper CLT flooring panel

Civil CLT as common temporary works for public construction | Hyper CLT flooring

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  • COMPANY

In public construction civil engineering sites, there are many instances where sheets are used as common temporary facilities, such as construction roads, access roads, heavy machinery work yards, material storage areas, and worker pathways. Traditionally, steel plates were common, but due to their weight, transportation and installation can be cumbersome. Hyper CLT sheets are civil engineering materials made from wooden CLT for civil engineering use. The 5×10 sheet weighs about 230 kg, and the 5×20 sheet weighs about 460 kg, making them lightweight and easy to transport, install, and remove, even with small machinery. They can be widely utilized for temporary roads, heavy machinery scaffolding, pathways within the site, and protection of material storage in public works. Since they are made of wood, they also contribute to environmental aspects such as reducing summer heat reflection, lowering noise, and fixing CO2. They can simultaneously address construction efficiency, safety measures, and environmental considerations, making them effective for innovative proposals in public works. Furthermore, they improve transportation efficiency and reduce labor in site operations as an alternative to steel plates. Hyper CLT sheets are registered technology with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS "TH-250021-A." They are recommended for companies considering civil engineering, civil engineering use, and civil engineering CLT. Feel free to request materials or consult about implementation. They are temporary materials that also help improve site evaluations in public works. Please consider them.

Jun 28, 2026

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[YouTube Update] Differences in Cleansing Ingredients You Should Know Before Developing an Original Shampoo

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  • COMPANY

We have released a new video on our company’s YouTube channel. The theme of this video is "The World of Amino Acid-Based Shampoos." Amino acid-based shampoos have become popular in recent years, but the lather, feel, and finish can vary greatly depending on the cleansing ingredients used. In this video, we clearly explain the changes in user experience based on the differences in cleansing ingredients by comparing two types of amino acid-based shampoos. We hope you can use this as a hint for developing original shampoos and differentiation.

Jun 26, 2026

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The 2nd Japan Go IPO Summit held in Tokyo in response to the growing momentum of Japanese companies in the U.S. capital markets.

  • NEW
  • COMPANY

New York and Tokyo, June 26, 2026 - (JCN Newswire) - This year's successful listing of PayPay Corporation (hereinafter "PayPay") on NASDAQ has provided a significant boost. The question now facing Japan's leading innovation companies is no longer "Is a U.S. listing feasible?" but rather "How can we attract global capital and build companies that align with global growth strategies?" The 2nd Japan Go IPO Summit will be held on September 16, 2026, at the Grand Hyatt Tokyo to address this question. This summit is hosted by MarcumAsia and organized by AUM Advisors. To register for this invitation-only event, please apply here: Japan GO IPO Summit Attendee Information https://events.marcumasia.com/view.php?id=32

Jun 26, 2026

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[Ministry of Economy, Trade and Industry Sponsored Seminar] "Eliminating Failures in AI Implementation" - Explanation of Successful Patterns in Manufacturing Sites with Real Examples (7/3)

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  • COMPANY

Our company representative, Shibata, will be speaking as a lecturer at the "Mikata Project" AI Utilization Seminar for the automotive industry, hosted by the Chubu Bureau of Economy, Trade and Industry. ■ Title: AI Implementation Course Leading to Results - Learning Success Patterns and Practical Processes from Real Examples in Manufacturing Sites "We implemented AI, but it is not being used on-site and is left unattended" and "The implementation has become the goal without yielding results" - we have seen many such stumbling blocks in manufacturing sites. In the seminar, based on real examples, we will discuss common patterns for successful implementation that lead to results, pitfalls to avoid, and practical processes to ensure AI is continuously used. We will also propose specific measures for sites struggling with technology transfer and dependency on individuals. ■ Event Overview Date: July 3, 2026 (Friday) 13:30 - 16:00 Venue: TKP Meitetsu Nagoya Station Conference Center + Online Participation Fee: Free / Application Deadline: June 30 (Tuesday) Organizer: Chubu Bureau of Economy, Trade and Industry (Automotive Industry "Mikata Project") Co-presenter: Satoru Hayami, Waseda University For details and registration, please visit the official page of the Chubu Bureau of Economy, Trade and Industry. If you are struggling with AI implementation in manufacturing sites, please feel free to consult us, regardless of region or industry.

Jun 26, 2026

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We will be exhibiting at "Okayama Monozukuri NEXT 2026"!

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July 16 (Thursday) 10:00 AM - 6:00 PM Venue: Convex Okayama Small Exhibition Hall

Jun 26, 2026

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