Our Craftsmanship｜Japanese seal case | Koseido Co.,Ltd

Our Strengths

Koseido seal cases are individually produced by hand by craftworkers following a methodical in-house production process from the frame to the final product. Our products are perennially popular for the reasonable pricing achieved with our efficient production process coupled with the high quality of expertly handmade items created by experienced craftworkers.

Handmade by methodical
in-house production process

Because each case is made by hand, we have the flexibly to change the designs to each customer’s specifications while maintaining our precision down to the millimeter. We are continuing to develop our processes so we can offer even greater flexibility in colors and designs for order-made items.

Millimeter precision

Although the world of craftworkers has long been associated with men, the staff at Koseido is a balanced mix of men and women, which we have proudly had for over 30 years. All of our staff are skilled in highly detailed work and at fully meeting and exceeding our quality standards. All workers have a role planning new products, developing sales channels, and contributing to the company’s growth.

Balanced staff of craftworkers

Our seal cases are made with high-quality brass frames. While other companies cut costs by using cheaper metals, we maintain our strict tradition of unwavering dedication to quality.

High-quality brass materials

Brass

Brass is a metal alloy composed primarily of copper and with 20% or more of zinc. Brass has a long history as a highly reliable material that is also suitable for metal fittings in high-end brand goods.

Advantages of Brass

●High malleability, making it possible to refine down to millimeters.
●Rust resistant, and oxidation is preventable with proper care.
●Attractive color that remains a bright gold color or changes over time depending on the alloy composition and exposure to heat.

We have obtained a utility model for the metal frames of our seal cases.

What is a utility model?: Utility model rights protect technical innovation in the shape, structure, and assembly of our frames.

What is Koseido’s utility model?: Our utility model recognizes the “increased safety of manufacture” of our metal frames when producing our seal cases.

How did Koseido acquire the utility model?: We acquired to the utility model based on an innovation developed by one of our female craftworkers. Koseido embodies craftsmanship not only in our techniques, but also in our ideas and our ability to implement them.