Want this question answered?
By model and serial number. Go to proofhouse.com
1912
1911
2006
1871
1910
probably WW1 era.................
1919
Just saw a site saying a serial number 88000 was manufactured in 1916. So it may give ya an idea.
No known sn data published.
No published sn data I am aware of.
Early 1930s