Cufflinks Vintage Showa Era PAT Unused Shell? Stone? Shell-like... I'm not sure about the material, but please check the photos and understand. Unused, it has been stored at home for a long time. Stamped PAT, and the other letters are small and unreadable... Please purchase if you understand. Please refrain from purchasing if you are concerned or are very sensitive. I plan to ship via Yu-Packet Post Mini. Showa Retro Vintage Black lip shell Shell