$50-$150 depending on condition. In Canada
1940 is turing year of cooey model 840he manifat
cooey 410 gauge model 840 Winchester Canada. single shot
Made in Canada
255920
V THE 840 WAS MADE AS A WINCHESTER BETWEEN 1961 & 1965, IT'S VALUE IS LOW COMPARED TO THE M 37. I JUST PURCHASED A GOOD 840 IN 410 FROM A LOCAL GUN STOREW FOR 85.00 JS
150 - 200 bucks in .410
yes you can but onaly riffled slugs
I found one on the internet for $195.... http://www.joesalter.com/detail.php?f_qryitem=5997
I have just acquired a cooey model 840 western Canada limited and I have done some research and talked to a few gunsmiths and from the info i have received a top-notch "perfect" model 840 will only run up to $275.00. If i was you i would keep it. It's a great little gun.
Could be from the 1960s, likely worth no more than $100. Try consulting your local sporting goods store.
Richard Cooey died on October 14, 2008 at the age of 41.