Hello I bought another rare Certina DS2 Super PH200 (I already had the one with black dial) but with blue dial ref 5801 303. It was the rival of the sub, the subsea a3630 and the seamaster 300 with two advantages that did not have its competitors the DS shockproof system and automatic winding system on Beryllium Bronze ball bearings and central ruby. The cal 25-651 from Certina is legendary for its reliability and precision. Watch in almost new condition from stock. Kind regards Georges