VINTAGE CASIO 31QR-20 QW.31 JAPAN YEAR 1976,VINTAGE CASIO 31QR-20 QW.31 JAPAN YEAR 1976,VINTAGE RARE 70's CASIO CASIOTRON 31QR-20 DIGITAL WATCH MINT CONDITION with box | #1476733409,VINTAGE RARE 70's CASIO CASIOTRON 31QR-20 DIGITAL WATCH MINT CONDITION with box | #1476733409,Very rare Casio 31QR-17 Early Vintage Digital Watch 1977.