No way to answer without a maker and serial number.
Around 1886.
made about 1891
1915
1912
1919
Around 1898.
A 12283
Proofhouse.com has Colt sn data.
about 1891
.22 cal
Impossible to answer without a serial number.
1896 for the .22 rifle small frame & 1888 for the medium frame (.32,.38 &.44 cal)