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
Vintage Casio ABX-53 Twincept LCD Digital Watch | #464654368
Casio CA-53WF-8B Calculator Beige Digital Mens Watch Original New Clas — Finest Time
Casio CA-53 / 3208 / All Models
Casio Calculator CA-53W: iconic vintage watch that you can still buy new | WatchUSeek Watch Forums