6538

[bertieng]

Anyone got the idea what is the correct stem for the 8mm crown to be fitted into the 6538 with the cal. 1030 movement? It seems that the thread size is even beyond the 120 caliber.

Thanks.

[alligoat]

In the book 'Rolex Daytona, a legend is born', a technical chart from 1970 refers to the 8mm crown with 110 Rolex thread size and 120 Tudor thread size. The Rolex crown is part # 22 and the Tudor crown is part# 24. Both are referred to as Twinlock. The corresponding tube was No 207- same for both.

From this, you would assume that the thread for the stem would be 110, since Tudor would be an early eta movement at that time.

Now the inside threads on your crown could be stripped out. This happened to me on my 1680 (1978) and I had to go with the update from the original 24-702 crown to the current 24-703 crown. The stem was ok and the watchmaker didn't have to replace it.

Finding a stem for a 1030 movt- WOW, where do you start? Good luck.

[bertieng]

Thanks for the info.

Finding a 1030 stem is no difficulty, but now if the thread is 110 then it is super troublesome since it is not standard Swiss size at all - either 90 or 120. I don't even think there is any adaptor that has the transformation to 110.

BTW, is the Tudor and Rolex 8mm Bervet share the same appearance and construction? If yes, then the Tudor crown would be the better choice.

[alligoat]

Can't tell you about the 8mm Rolex and Tudor Brevet crowns- all I have to go by is the Daytona book and it's crown table from 1970. Sounds to me like you need a vintage Rolex watchmaker. Good luck!