Nakaya Dorsal Fin Version 1 Ishime-Kanshitsu Aka-tamenuriThe 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. Nakaya has created something unique with its Dorsal Fin series