Original stainless steel case is decidedly massive and sporty for the 1950s. Dimensions are 35mm diameter by 13.8mm thick. Massive screw back. Highly domed acrylic crystal. Round pump-style chronograph pushers and large winding crown. Case appears to be never polished and to have its original sharp edges, corners and bevels.
Original untouched dial started out as silver but has developed a champagne patina to very nice effect. Applied '12', Omega logo and hour markers. Sunken subdials with concentric guilloche. Tachymetre scale at the dial's periphery. Original hands.