Marty Mcfly Casio CA-50, Common to popular belief the CA-50 was the original Casio worn by Marty Mcfly, before he wore the CA-53 in the later scenes! This is mine I sourced
NOS CASIO CA-50 "NISSAN" CALCULATOR VINTAGE DIGITAL WATCH JAPAN 1984のeBay公認海外通販|セカイモン
Casio CA-50 Calculator Watch Module 437 Nerd Vintage Back to - Etsy 日本
Casio CA-50 & CA-53w] Marty's Casio vs. the one still sold to this day. : r/Watches