Cooey Model 840 Serial Number Lookup [best]

Why is there a ledger or proof mark instead of a serial number?

The original production run. Early versions are stamped "H. W. Cooey Machine & Arms Company" . Cooey Model 840 Serial Number Lookup

If your serial number provides a clue, the markings on the gun can confirm the story. These are definitive: Why is there a ledger or proof mark

Some of the stamps can be faint or, in some cases, partially obscured by the wood stock. in some cases