Certina, Argonaut 220, a gentleman's stainless steel wristwatch, circa 1990, ref. 5201-220, No 7864797, the two piece screw down case with blue-bordered black dial, luminous baton numerals and hands, the 17 jewel Certina movement cal. 25-66, on a block pierced rubber strap, case 4.1cm long including lugs