Proofhouse.com has Colt sn tables.
1912 is a best estimate.
1912
1911
1910
2006
1871
Early 1930s
No sn data available
No published sn data
No published sn data. @ turn of the century
No sn data I know of.
No published sn data.
Just saw a site saying a serial number 88000 was manufactured in 1916. So it may give ya an idea.