Rich,
I believe that your gun is a 1 1/2 frame. If you look on the barrel lug you can see the 1 for the 1/2. I have seen this alot on guns around your serial number. I believe that the stamp was worn and didn't stamp the whole number. I have a couple of guns stamped like that. There are several gunsmiths out there that will fix your butt plate with black accu glass. They can also fix the wood if you want it fixed. My advise is to enjoy shooting it.
Jeff
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