Bill
31988
This gives some guide line but not real explination
I seem the order is exclamation followed by underline with the overlap in the middle.
so we could say the most logical time line is:
Exclamation
1961-1963 with a serial range 600,xxx - 990,xxx
Underline
1962-1963
+/- 800,xxx and upto the end of the pointed crown guard +/- 1,1xx,xxx
Not an exact science for sure. This does seem to match the gmt and subs in that period.
Bill
Interesting
By: Le Monde Edmond : May 15th, 2014-01:03
Bill thank you for the post. I read it with great interest as I also have a 5512 with exclamation point dial. However my case back is from I 1962 (first period). The serial Nr is 870 xxx. I love your version with the copper like gilt printing of Rolex and...
That sounds all correct
By: Bill : May 15th, 2014-07:35
Later serial with a later date case back. AS Marcello noted 1962 started around serial 750,xxx. The interesting part is to see up to what serial do we find the exclamation. Your example sets it to atleast 870,xxx. Thnaks Bill