In 1958 the Rolex Submariner reference 5512 was introduced as with Rolex nothing is absolute. This reference was produced from 1958 (I can substantiate that date 58 as I have seen a 2 line 5512 with a serial number 371,
www.luxury4ubest.com,xxx) and continued through 1978 with several calibers over the years. I am sure there will be some controversy but the 1030 may also have been used in the early years. However I have not hard facts just shifting information. The mainstay calibers included 1520, 1530, 1560 and 1570. I have seen several from 1961 / 62 that carried the 1560 caliber. The 5512 did not as a rule carry the C.O.S.C. certification for its entire production,
www.chrono2u.com, but it did have the chronometer certification in the last years of production.
Here is the link: