Rolex Production Dates By Serial Number...
The serial number is located at 6 o'clock between the lugs and under the bracelet.
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Rather than begin an 8 digit production serial, Rolex instead began their serials with a letter prefix
such as R, then L, E & X. (ROLEX without the O) N, C, & S came out during the early to mid 1990's, W, T & U a little later. The latest letter prefixes are all running concurrently...as Rolex
wishes! Only Rolex knows the exact date that any watch was actually produced. Confused...contact Rolex with the exact serial number of your watch...don't expect a reply with
an answer!
* When Rolex reached the 999,999 production serial in the early 1950's...they restarted the
production serial at 100,000 rather than begin a 7 digit number at 1,000,000. During this period Rolex was also putting the date code on the inside of the case backs...so confusing production
serials can sometimes have their production date determined. Look for the Roman number I, II, III or IV for the quarter & two arabic digits for the year.
In the late 1950's, Rolex again reached the 999,999 production serial & they started their 7 digit numeric numbering system at 1,000,000 for production serials, this continued until the 1990's until production serials reached 9,999,999.
