Looking at the craftsmanship of the legs and the part where the strings rest, you can see the meticulous detail, which clearly distinguishes it from other manufacturers. The design is different from current products, so it's likely from a time when they were sold in very small numbers only through face-to-face transactions, or perhaps a prototype. Height: 11mm, String spacing: Approximately 10mm I believe the material is mammoth tusk, but given the design predates the period when Miyako Mokugei obtained a license and began selling, it's possible it's a higher-grade material. I don't think you'll have another chance to get this, so please consider it positively. Mammoth horse bridges are also popular products and are always sold out online, so don't miss this opportunity! I felt there was almost no difference in sound compared to current products. Referenced from Miyako Mokugei's HP: Compared to standard bamboo horse bridges, the high-frequency tones become smoother, resulting in an overall mellower sound. The mid-to-low frequency sound pressure increases, and the warm, deep tones have a characteristic long resonance. When attached to sanshin with artificial skin or reinforced skin (double-layered), the artificial, tinny, and buzzing noises are reduced, transforming the sound into a soft tone reminiscent of a single layer of genuine skin. And the resonance of that soft tone lasts longer. However, it is not very suitable for sanshin with soft skin or single-layer genuine skin with a 5-7 minute tension. The mid-to-low frequencies will be overemphasized, resulting in a rather unique tone. Typically, commercially available horse bridges have "two legs," but this one has a "four-legged" design, allowing it to be installed regardless of the front or back, and above all, it offers excellent stability. Note: Please refrain from purchasing if you are looking for shop-level quality or are overly sensitive to detail.