Certina DS-2 automatic watch

Certina DS-2 automatic watch with a slightly rarer two-tone dial. Crystal is in good condition, only one mark can be found around six o'clock, right on the edge of the crystal. Case has signs of age and use and there is an engraving on the caseback. Crown is original and the leather strap has been used. Service history is unknown, but the watch works well. Date changes and the watch is running approximately +- 30 seconds per day.