They were made from about 1910-1935. Records are patchy at best, yours is likely from AROUND 1919-1920, but dates are uncertain.
1912
1910
1911
1871
2006
Early 1930s
No sn data available
No published sn data
No published sn data. @ turn of the century
No published sn data.
No sn data I know of.
These were made by the Iver Johnson Company from 1910-1935. Your revolver is from around 1930.