Vintage Seiko LCD Calculator Chronograph C439-5010 Working | eBay
Bid Now: Seiko Calculator Automatic wristwatch chronographwith 30/60-minute counter, 12-hour counter, day of the week (German/English) and date, - March 6, 0123 1:00 PM CET
Seiko C359-5000 working Calculator with original bracelet for repair | eBay