Seiko quartz watch 7321-5600/ case no.5N8181, made in Japan.,Seiko 7321 5600 Black Dial Men Quartz Watch - Square Tank Shape 30mm | eBay,Seiko 7321 5600 Black Dial Men Quartz Watch - Square Tank Shape 30mm | eBay,Seiko quartz watch 7321-5600/ case no.5N8181, made in Japan.,Seiko 7321 5600 Black Dial Men Quartz Watch - Square Tank Shape 30mm | eBay