WTS] Seiko SKX031 Mil-Sub homage mod. Sapphire crystal, ceramic bezel insert, NH36 movement, signed crown. $500 net to me shipped free in conus : r/Watchexchange
SEIKO Mod SKX031 Ceramic Bezel Insert SKX SUB BLACK - Chronospride
Amazon.co.jp: Bezel Insert for Seiko Skx031 Skx033 J + K Submariner 100 M Blue #1 : Ewatchparts: Clothing, Shoes & Jewelry
All About the Seiko SKX031 aka The Poor Man's Submariner – namokiMODS