vintage watch mens Certina DS pre turtle Automatic 25-45 ref 5601 012 steelFrom the late 50s early 60s one of the earliest Certinas DS models ever made (first certina ds automatic), recently serviced by watchmaker.. DS models do not have serial numbers, but the range was launched in 1959 and the technology patented in late 1958. This early watch still has "Swiss patent pending swiss" inside the case back. These early watches never had the turtle embossed caseback either. Case: o All in stainless steel polished with marks and