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Welcome Aboard IHC185™     Internet Horology Club 185    IHC185™ Discussion Site Main Page  Hop To Forum Categories  Open to the World RESEARCH FORUMS  Hop To Forums  Hamilton and 992B Research Forum    Can anyone clarify the difference between a 940 & 942 Hamilton PW?
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Can anyone clarify the difference between a 940 & 942 Hamilton PW? "Click" to Login or Register 
posted
I have a couple of both. I know there were a great many more 940s made than 942s. My watchmaker friend had promised to show me but he passed away before we had a detailed discussion.
Thanks,
Rick
 
Posts: 16 | Location: Upstate South Carolina in the USA | Registered: November 06, 2013


posted
Richard,

Here is a 942 from my collection

The dead give away of the 942 movement is the wavy (ribbon) demaskeening pattern around the outside edge of the movement plate. In the provided photo - if you look where the serial # and adjusted are stamped on the movement you can see the ribbon clearly. This pattern is not found on the 940 (an example pictured below)

 
Posts: 7342 | Location: Illinois in the USA | Registered: November 11, 2011


posted
And a 940

 
Posts: 7342 | Location: Illinois in the USA | Registered: November 11, 2011
IHC Life Member
Picture of Eugene Buffard
posted
Jon look at where the banking pins are at on the 942.

I'm guessing the the 942 has a completely different pallet fork assembly.
 
Posts: 3408 | Location: Illinois in the USA | Registered: July 06, 2010
IHC Member 1517
posted
Based on the movement pictures I have, there was a change to the pallet/banking pin configuration on later 940's. The ones before around sn653000 had the same banking pin location as the 942. One other obvious difference between the two is the flat head plate screws on the 942 vs the domed ones on the 940.
 
Posts: 357 | Location: Woodland Hills, California in the USA | Registered: January 07, 2011
posted
Thanks guys. You give great info. I love the 18s hamilton's. I tend to have more 942s, 944s than 940s. thanks for the help.
Rick
 
Posts: 16 | Location: Upstate South Carolina in the USA | Registered: November 06, 2013
IHC Member 1555
posted
i think you might find Gene that the pallet forks assemblies are not that different unless the 942 was made with single roller. The position of the banking pins on the 942 have just been moved to the back of the fork, this is seen on a lot of earlier full plate watches (942 in the photo is much earlier serial# then 940). The 940 has them just behind the yoke, positional difference only and still can have same fork design. Smile

Cheers,
Bila
 
Posts: 1970 | Location: Gladstone in Australia | Registered: January 14, 2011
IHC Member 665
posted
The 21J Grade 942 always had a double roller escapement, as did its 17J Grade 938 predecessor.
 
Posts: 185 | Location: East Melbourne, Victoria, Australia | Registered: December 31, 2005
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