SQ 50 Auto Calendar Multi-Function 6M26-8050, ca. 1996

Diameter of the Watch is 38 mm

and the styling is consistent to the so called Sports Elegance styling SEIKO introduced in the late 80ies. Compare this watch also to my SQ100 Multi-Function Alarm Chronograph on this page.
The watch sits very nicely on the wrist, the bracelet is a solid link bracelets and it is special, because all links can be removed. See the back shot of this watch for details.