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The most telling feature is the way that each fits there respective receiver tangs.The model 1897,and the Model 12 were different designs,thus the tang on each has different dimensions.
Model R-12
It should be on the lower tang, under the lever. On some of the very early models, it may be on the upper tang.
Remove the large screw visible in the top tang behind the hammer. Bump the stock off to the rear using the heel of your hand against the comb of the stock. sales@countrygunsmith.net
Usually on the bottom tang, underneath the lever. Some later 39a's have it on the top tang, behind the hammer.
Remove the butt plate on the shoulder stock, at the bottom of that big hole is there's one big screw flat head that holds the stock to the receiver. There may also be a single wood screw at the very end of the lower tang as well on some models.
On the lower tang behind the lever.
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Depends on the model, and condition. Model number should be under the receiver, or on the top tang, unless it is a model 1898, which had no markings to indicate model.
tang ina this
A model 39 had the serial number in front of the trigger guard, not on the lower or upper tang. Are you sure this isn't a 39a? If the serial number has been removed, it can be found under the buttstock on the left side of the upper tang. Any removal, or obliteration of a firearm's serial number is a Federal offense.
There is no such thing as a "model 702337". The number you list appears to be a serial number. The Model number will be stamped on the barrel, or on the upper tang behind the hammer.