It is always curious the numbering. Earlier Rolex watches the serial was on the case back outside. Sometimes the reference or model number was also there. The reference was also often stamped on the inside of the caseback. Sometime around when the casebacks became more rounded, probably for comfort, being that they were so deep to accommodate the automatic mechanism...they switched to placing the serial between the lugs...except on the hooded models. The shape of the rotor weight was also changed. Whether the weight change prompted the back shape change or visa versa it is not known. The reference is usually stamped at 12:00 and the serial at 6:00 between the lugs after 1945. I do believe you have a model 2674 and that is probably stamped on the INSIDE of the caseback. It is all quite random in a kind of sensible way.
You have a very nice watch. Wear it in good health. I would recommend servicing the watch if you intend to wear it as the automatic mechanisms are prone to wear. Geneve used replace the bushings with jewels and you might likely find that on opening the case. The watches don't time well when they run dry but can be made to run sometimes very accurately even though they are quite old, depending on how much wear has taken place.
This message has been edited by RolexWatchTime from IP address 126.96.36.199 on Nov 16, 2011 10:08 AM