Whether you are trying to sell, insure, or simply preserve a family heirloom, here is what you can do instead of a serial number lookup:
If your receiver has no number, your shotgun was manufactured between 1938 and 1961 in Cobourg, Ontario. These are the most common versions. You can narrow down the era by examining the extractor and bolt handle: Cooey Model 840 Serial Number Lookup
When identifying your gun, check for these specific variations which can affect value and identification: Whether you are trying to sell, insure, or