But here’s the catch: There is no known, comprehensive factory ledger. They often used batch codes, inspector stamps, or Winchester-era numbering systems that overlap confusingly with the Cooey Model 60 and 600.

Consult reference books:

Before the U.S. Gun Control Act of 1968, Canadian and American manufacturers were not required to serialize budget-friendly firearms. The Cooey 840 was a “utility gun”—made to be affordable, not tracked. As a result: