Nakaya Dorsal Fin Version 1 Ishime-Kanshitsu SuzuThe Nakaya Dorsal Fin Version 1 is one of the most innovative and distinctive designs created by Nakaya. Layers of urushi lacquer are applied over a period of months to create the fin on the cap, and the surface is then completed with either smooth urushi or stone texture Ishime Kanshitsu finish. With either finish, this is one of the most memorable writing instruments Nakaya has produced. In Suzu ishime technique, tin flakes are mixed with dried