The Scafograf 300

From Eberhard -

Courtesy of Eberhard

Stainless steel case, measures 43 mm in diameter.  Water resistant to 300 meters.  Screw down crown and case back.  The unidirectional bezel is of ceramic with a diver's countdown scale.  The movement is ETA's 2824-2.  Secured with a black rubber strap.