Seiko Speedmaster 7A28-7050 Vintage Quartz Operation | eBay,7A28-7050] Something unique for today. Seiko 7a28-7050 Speedmaster Chronograph from 1983. Designed by hall of fame car designer Giorgetto Giugiaro. Rotating case feature for better visibility while driving. : r/ Seiko,SEIKO 7A28-7050 SPEEDMASTER | watchshop L,April 1983' Seiko 7A28-7050 Rotating Chronograph all original | The Watch Site,SEIKO 7A28-7050 SPEEDMASTER | watchshop L,