Any authentic Model 840 stamped with "Cobourg, Ontario" was made before the 1979 shutdown.
You might spot small, stamped symbols like a "C" with an arrow inside it (the Canadian broad arrow) or a Winchester proof mark (a "WP" inside an oval). These are quality control and military/government proof marks, not serial numbers. Is a Cooey Model 840 valuable? Cooey Model 840 Serial Number Lookup
If your Cooey Model 840 has a serial number, it will be stamped directly into the metal components. Check the following locations: Any authentic Model 840 stamped with "Cobourg, Ontario"
If your barrel reads without mentioning Winchester, it is a Model 84, not an 840. Is a Cooey Model 840 valuable
Cooey Model 840 Serial Number Lookup: A Collector’s Guide If you’ve inherited a rugged single-shot shotgun or found a deal on a "Made in Canada" classic, chances are you’re holding a . These firearms are staples of Canadian hunting history, known for their simple break-action design and reliability.
Before looking up a number, you need to find it. Many Model 84/840s do not have a standard serial number on the receiver, but they are often marked with numbers on other parts. Check the hinge area under the barrel. Receiver: On the right side, underneath the stock.