SCUBARPO 500 TUNA CAN Catalogue number: 57105. Serial number: 2156. Steel case. Protective plastic cage. Black dial, date window at 3 o'clock. Self-winding mechanical movement (ETA 2784 calibre). Rubber strap with pin buckle. Sapphire crystal. Circa 1970. Diameter: 48 mm. A stainless steel wristwatch automatic movement, by Scubapro. Circa 1970. RC : Sold as is, traces of wear and use. Movement functional at time of writing, no warranty.