I understand the interest in tracing the history of an Iver Johnson revolver, especially given their popularity from the 1880s to the mid-20th century. However, I need to provide an important clarification upfront:
These are the most reliable, though incomplete, resources: Iver Johnson Revolver Serial Number Database BEST
3rd Model (1909–1941). These were redesigned for smokeless powder . 2. The Letter Prefix I understand the interest in tracing the history
Cataloging format and database structure Match model & patent date to approximate year range
Twenty years later, the grandson—now an amateur historian—entered the revolver’s details into the online database:
Here is the definitive ranking of the available to the public.