American PW Hamilton 992B Roller Jewel Replacement

[Grant Perry]

Hello,
I have an e-bay purchase that is missing a roller jewel. It is a 992B with serial #449459.
I am hoping that someone might tell me if I need to look for a specific size, or did the 992B have a standard jewel which I can buy using a Hamilton part number as I do not have the original jewel for comparison.
Thank you in advance,
Grant

 

[Randy Beamer]

Hello,
I have an e-bay purchase that is missing a roller jewel. It is a 992B with serial #449459.
I am hoping that someone might tell me if I need to look for a specific size, or did the 992B have a standard jewel which I can buy using a Hamilton part number as I do not have the original jewel for comparison.
Thank you in advance,
Grant


View attachment 613587 View attachment 613588

Grant,
You may have to do some adjusting to length regardless of what you find.
On that note,..type this into the search field and you will get some answers and even a part number
Roller jewel size for Hamilton 992

Best regards...nice watch !!

Randy

 

[Grant Perry]

Thank you Randy for the quick reply. I tried the search for the 992B, but there doesn't seem to be a clear answer on a part number.

 

[oldetymes]

Grant,
You may have to do some adjusting to length regardless of what you find.
On that note,..type this into the search field and you will get some answers and even a part number
Roller jewel size for Hamilton 992

Best regards...nice watch !!

Randy

Thank you Randy for the quick reply. I tried the search for the 992B, but there doesn't seem to be a clear answer on a part number.

Grant,
You may have to do some adjusting to length regardless of what you find.
On that note,..type this into the search field and you will get some answers and even a part number
Roller jewel size for Hamilton 992

Best regards...nice watch !!

 

[oldetymes]

Hi Randy

Hello,
I have an e-bay purchase that is missing a roller jewel. It is a 992B with serial #449459.
I am hoping that someone might tell me if I need to look for a specific size, or did the 992B have a standard jewel which I can buy using a Hamilton part number as I do not have the original jewel for comparison.
Thank you in advance,
Grant

 

[oldetymes]

Hi randy - a common way to determine the roller jewel replacement is to measure the inside of the fork and deduct .02mm for clearance and purchase that size from one of the material houses like Jules Borel. Pocket watch database shows that as an 18s so I am thinking you have a single roller and will need that size in the long roller jewel. For reference, double rollers typically use the short roller jewel.

best, Dave

 

[Grant Perry]

Sorry Dave,
I omitted a digit. It is C449459. It is a 16 size 992B.
best regards.
Grant

 

[topspy]

I don't have a 992B handy or I would measure for you. If you can get a set of roller jewel gages like these, you can measure the fork slot and subtract .02mm. Then just order that size roller jewel, but make sure to order the "short" one since it is a double roller - single rollers use a longer jewel.

 

[Grant Perry]

Thank you, I don’t have a gage, so it is a tool I will need to look for. Thank you for the advice on the shorter option for the jewel. Are there typically only two lengths available, long or short?

 

[179]

If i remember correctly 992b's used a bronze roller with a friction fit (no shellac) jewel, and a short jewel is correct.

 

[Jim Haney]

The Hamilton part number for just the bare jewel is

270010 which fits all 18-16 size watches Except the 992E

The part number for the roller w/jewel is 349041 for 950B-992B watches.

 

[Kevin W.]

Hi Grant, Daryl Lesser may know the answer to your question.

 

[Grant Perry]

Thank you Jim, I appreciate your help identifying the parts. I see from my search so far that this could be a difficult part to find.
Best regards,
Grant

 

[Dave Coatsworth]

To determine size if you don't have a roller jewel gauge... If you do have a small drill index or some various size needles, find one that just fits snugly in the pallet fork slot and then measure that with a micrometer. Then subtract 0.02mm.

The jewel will be easy to find if you can determine the size.

 

[Grant Perry]

Thank you Dave. That I can do. The existing jewel is gone and the hole is open. Does the jewel actually nee to fit in the hole, or is the hole for securing the jewel with shellac? Also, 179 noted above that the jewel required is the shorter one. How do I determine the appropriate length?
Thank you!
Grant

 

[179]

Slightly higher than the safety roller, but long enough to reach the fork slot.

 

[Dave Coatsworth]

The 'short' roller jewels run about 0.9mm-1.0mm. Longs run about 1.2mm.

 

[Dave Coatsworth]

The existing jewel is gone and the hole is open.

If the hole is open and you don't see any shellac residue, it is likely that it is a friction fit. I also seem to recall that being the case with the 992B.

 

[Grant Perry]

Thank you all. I have ordered a jewel. I'll let you know how it turns out.
Grant