The Winchester model 1873 rifle was chambered in 3 different calibers,plus at one time a .22cal rimfire.The 3 calibers are 32-20 Win(32WCF),38-40Win.(38WCF),and 44-40Win.(44WCF).If these markings do not appear on your rifle due to age and having been worn off,then a competent gunsmith will have to do a chamber casting to determine the correct caliber.If you are curious the serial number that you supplied indicates that your Winchester model 1873 was made in 1888.
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