Cooey Model 840 - Serial Number Lookup [portable]

Read the text stamped onto the side of the barrel. The wording reveals the factory timeline:

Units stamped with were made earlier in the production run.

There is for Cooey 840 serial numbers. Not from the RCMP, not from Winchester, and not from the original Cooey company (which closed decades ago).

Since no official database exists, dating your Cooey 840 involves a combination of examining its features, markings, and, where possible, comparing its serial number to known examples. Cooey Model 840 Serial Number Lookup

Before 1968, firearm regulations in Canada and the United States did not strictly require serial numbers on rimfire rifles or shotguns. Since the Cooey Model 840 was designed as an affordable, utility firearm, the H.W. Cooey Machine & Arms Company (and later Winchester-Western) often omitted them to keep production costs low.

Note: If you look closely at these areas and find absolutely no numbers, your shotgun was likely manufactured for the Canadian domestic market prior to the standardization of serialization in the late 1960s. How to Decode the Cooey Model 840 Serial Number

Look for "H.W. Cooey Machine & Arms Co. Ltd." stamped on the barrel. Read the text stamped onto the side of the barrel

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This guide provides you with the best-known methods, tips, and historical context to help you date your Cooey Model 840.

: Look for small, stamped symbols near the breech. A small stamped "WP" (Winchester Proof) inside an oval indicates strict Winchester quality control testing, typical of post-1961 production. Step 3: Check for Date Codes Not from the RCMP, not from Winchester, and

The Cooey Model 840 was introduced during this Winchester era as the direct successor to the highly popular, pre-1961 Cooey Model 84. While it retained the single-shot, break-action mechanism of its predecessor, the Model 840 featured a redesigned receiver, a modified forend latch, and different stock options. It was produced in various gauges, including 12, 16, 20, 28 gauge, and .410 bore.

Note: The 'F' prefix was not a standard chronological run. It was allocated to a special contract in 1964, two years after Winchester acquired the company. These were "transition" guns—Cooey actions stamped with the standalone name, but built with higher-grade Winchester steel specs for a government contract (Department of Lands and Forests).

So if you’re hoping to enter a number online and get a production year—you won’t. But you can date your rifle using other clues.

Because a master lookup database does not exist, use these production eras to estimate the age of your firearm. The Pre-Winchester Era (1965–1961)