Rolex 16013 Production Years. 890xxxx pre letter serial number circa 1984 movement. A reset in 1954.
This was also the same year of the 40 year anniversary of the rolex company. With the datejust having been in unceasing production for more than thirty years this fourth generation had their aesthetics wholeheartedly established. The datejust was introduced as the world s first pressure proof self winding calendar.
For the first 10 years of production the date shown at the 3 o clock position was not yet enhanced by the well known cyclop lens.
The rolex serial numbers are found between the lugs on the side of the case at the 6 o clock side behind the bracelet this 4 8 digit number is engraved by rolex on every watch and it can be used to determine its production date. The rolex datejust was introduced in 1945 and appeared very similar to the rolex bubbleback. For the first 10 years of production the date shown at the 3 o clock position was not yet enhanced by the well known cyclop lens. A reset in 1954.