131. 131Y Oris. A metal base manual wind single pusher chronograph wristwatch Oris. Chronographe bracelet mono-poussoir en métal mouvement mécanique Model: ChronOris Date: Circa 1970 Movement: 17-jewel Cal.725 manual wind Dial: Black, white pointed baton hour markers with luminous dots, white outer 1/5th second divisions, orange and silvered raised inner bidirectional bezel calibrated for 60 minutes, date aperture at 3, white and black pointed baton hands with luminous inserts, luminous orange centre chronograph hand Case: Brushed and polished tonneau form, screw down back, chronograph pusher at 2, crown at 4, further crown at 3 for inner rotating bezel Strap/Bracelet: Black Oris shark leather Buckle/Clasp: Steel buckle Signed: Case, dial & movement Size: 38mm