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You need the services of a gunsmith
You must measure it. Different stocks were available.
Best left to a gunsmith.
Take it to a competent gunsmith.
Winchester produced 720,609 model 1873 rifles between the years 1873-1923.
Winchester was not making pistols in 1873. If you provide all markings, type of barrel, barrel length, type of action, type of stock, caliber, and if possible pictures, someone might be able to help you.
Your Winchester model 1873,was made by Winchester in 1891.
Your Winchester model 1873 rifle was made by Winchester in 1904,with the serial number that you provided.
your model 1873 Winchester was made in 1888,any Winchester 1873 has quite a bit of value,that being said it should vary according to the amont of blueing on the barrel,the barrel inside condition(any pitting),wood finish left on the wood,any cracks in the stock(forearm and buttstock)?You may get a value on this if you have a book by s p fjestad.It is called the blue book of gun values.
1873 winchter 32 20 333824b
very carefully... :) Seriously, take it to a gunsmith. The barrel is probably pressed into the receiver and pinned.
That would be an amazing find. The 32-20 (32 WCF) cartridge was not introduced until 1882 for the 1873 Winchester rifle.