3055. Y Certina. A stainless steel manual wind chronograph wristwatch Model: DS-2 Chronolympic Reference: 8501.800 Date: Circa 1970 Movement: 19-jewel Valjoux Cal.726 manual wind, column wheel chronograph Dial: Black, polished faceted baton hour markers with luminous inserts, white outer 1/5th second divisions and tachymetre scale, subsidiary dials at 3, 6 and 9 for seconds, 30 minute and 12 hour recording, white pointed baton hands with luminous and black inserts, red centre chronograph hand Case: Brushed and polished tonneau form, screw down back with Certina turtle logo, No.8311450 Strap/Bracelet: Associated black sharkskin leather Buckle/Clasp: Associated steel buckle Signed: Case, dial & movement Size: 43mm