Reply To: Vulcain jump hour

Hi Charles,
Congratulations on zeroing in on the problem!
If it’s manual wind then it may be an AS 1901. The AS 1901 is 17 jewels. They used the AS 2072 for their auto winds.
Found a couple of links that you can check to try to identify your movement.
This one is for the AS 1901 http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&AS_1901
This is for the AS 2072 http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&AS_2072
Hope this is helpful Charles,
Good luck and please let me know what you find out.
Bob