Nobody knows this for sure.
you have to provide the serial number
With the serial number that you have provided,your winchester model 1873 rifle was produced in the year 1891.
With the serial number that you have supplied,your Springfield model 1873 rifle was made in the year 1874.
Your Winchester model 1873 was produced in 1875.
Your Winchester model 1873 rifle was made by Winchester in 1904,with the serial number that you provided.
With the serial number that you have supplied,your Springfield model 1873 rifle(actually a model 1884) was made in the year 1888.
with the serial number that you have provided,your Winchester model 1873 lever action rifle was made by Winchester in the year 1886.
With the serial number that you provided,your Winchester model 1873 rifle was produced in the year 1883,and was 1 of 35,995 made that year.
The serial number that you have supplied,indicates that your Springfield model 1873 rifle/carbine was made in the year 1880.
Your Winchester model 1873 was made in the year 1889,with a serial number of about 300,000.The year 1889 started with serial number 284,530,and ended with serial number 323,956.
With the serial number that you provided,your Springfield model 1873 trapdoor model rifle was produced in the year 1875.
There is no way of knowing this.All records of the US model 1873 springfield rifle/carbine will not have what regiment was issued which rifle by serial number.