American PW Balance staff info needed.

Kevin W.

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Apr 11, 2002
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Can someone help me identify which staff i need for this watch.
It is a Elgin, 18 sz, 15 jewels.Grade 317, Serial number is 15015031.
Thanks for your help.;)
 

Kevin W.

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Apr 11, 2002
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Thanks Doug, much appreciated.:p
 

Kevin W.

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Apr 11, 2002
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bkerr, one pivot is broke i will measure every thing i can before i cut the old one off.Thanks for the heads up.
 
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RJSoftware

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Apr 15, 2005
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Vert.

I wish somebody would give me details on how to precisely measure the staff dimensions.

I only have a veneer caliper and a 10x loupe -so far. But the caliper does have sharp blades to measure with. (Measures in .001" -inch).

I can see measuring the diametors. But how does one measure the lengths?

I seen Bkeer's post of more elaborate measuring tool but not sure how it would be used.

RJ
 

ben_hutcherson

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Jul 15, 2009
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Rather than measuring, which would be difficult with a broken pivot, here's a quick rule of thumb:

If the serial number is under 3,000,000, you probably need the old style(short) staff. If the serial number is over 3,000,000, you probably need the new style(long) staff.

Short vs. long hub is easiest to determine by comparing the pictures of your current staff with the pictures available in the material catalog(which is available online). The difference between the two is pretty obvious even without magnification.

Chances are pretty good that you need a new style, long hub staff. This is the most common type, and in fact will commonly just be called simply an 857 when ordering(the others will specify O.S. for old style and S.H. for short hub).
 

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