Cooey Model 840 Serial Number Lookup [hot] May 2026

Dating a Cooey Model 840 is notoriously difficult because no official factory production logs survived the closure of the Cobourg, Ontario plant in 1979. However, you can narrow down its age by examining specific physical markings and manufacturer stamps. The Problem with Serial Number Lookups

Would you like help identifying your specific Cooey 840 model by photos or markings instead? Cooey Model 840 Serial Number Lookup

• Production Window: The Model 840 was manufactured roughly between 1948 and 1979.
• Pre-1968 vs. Post-1968 (The Import Mark Era):

  "H.W. Cooey Machine & Arms Company": Indicates production before 1961, when the company was independent. Since the 840 wasn't introduced until the late 60s, you will rarely see this on an 840 unless it was a very early transition piece. "Winchester-Western (Canada) Limited" : This is the most common marking for the Dating a Cooey Model 840 is notoriously difficult

  Some Cooey-branded firearms made before 1968 were not legally required to have serial numbers, though many Model 840s (produced post-1967) do feature them. Winchester Collector Dating Your Model 840 Production Window: The Model 840 was manufactured roughly

  Versatility: It was chambered in 12, 16, 20, and 28 gauge, as well as .410 bore. Durability: The action is famously overbuilt.

  So next time you pick up a Model 840, don’t look for a date. Run your finger over the bare metal where a serial number should be. That empty space is a piece of history—a quiet rebellion of a simpler time in Canadian firearm manufacturing.

  Occasionally, you will find a small letter stamped near the breech or on the trigger guard. While not a serial number, these are often factory proof marks. While there is no definitive public ledger for these codes, they generally signify the inspector or the specific assembly line. Why the Model 840 is Special