Certina Argonaut 8401

CERTINA intermediate wheel chronograph Argonaut reference 8401, manual winding, Switzerland around 1970, cushion shaped stainless steel case, screwed down case back, winding crown neutral replaced, silvered contrast dial with black sub-dials due to age slightly faulty, tachometer graduation, display of hours, minutes, constant second and chronograph, rhodium plated movement, 17 jewels, calibre 29-063 (Valjoux 236), flat rim balance, Breguet balance-spring, incablock shock-absorber, measures approx. 42 x 38 mm, condition 2-3, property of a collector