Internet Horology Club 185
Waltham model 92 staff Q

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https://ihc185.infopop.cc/eve/forums/a/tpc/f/3426047761/m/1526056702

January 20, 2003, 21:41
Mike Miller
Waltham model 92 staff Q
Does anyone know which grades of model 92s used balance staff 1703 (short) and which ones used 1703A (long)? I kinda found out the hard way that there were two versions of these staffs.

Mike Miller
NAWCC Member# 154831
NAWCC-IHC Charter Member# 27
January 21, 2003, 04:47
Brian C.
Mike,
1703 is for a single roller and 1703-A is for a double roller.
Brian C.
January 21, 2003, 15:44
Mike Miller
Thanks Brian, that makes perfect sense. Is there an actual difference in entire length of these two staffs?

Mike Miller
NAWCC Member# 154831
NAWCC-IHC Charter Member# 27
February 03, 2003, 02:29
John D. Duvall
Mike,

Here ya go:

1703 - 5.70 mm long with a .70mm hub and pivot sizes 11 & 12mm.


1703A - 6.00 mm long with a 1.00mm hub and pivot sizes 10, 11 & 12.

All other dimensions are the same for both staffs.

John D. Duvall
Rosamond, CA.
NAWCC Member 144772
NAWCC IHC Member 192