Quote:
Originally Posted by crowncollection
your watch is a 16013, you need a lettered serial number to have a sapphire crystal glass on a datejust, it started with R series 1987. hope this helps regards.
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1987 is the last year of s/n with 7 numbers, and the first of lettered s/n. So for this year you can have both type of s/n on a DJ.
So the very 1st DJ with sapphire can have a 7 numbers s/n.
The one we are talking about is from 1986, so it should be a 1601x except if it was a Rolex protoytpe (what I don't seriously think of course).