They were made between 1978-89. If you want more information I suggest you contact Daisy directly. They offer a service to tell you about you old daisy and it's free. See the link below.
stevens bolt action 22 model 840
The model 840 Grizzly is rated at 350 FPS (Feet per second) in both Pellet and BB. This is not considered a very powerful rifle but perfect for youth and target practice.
cooey 410 gauge model 840 Winchester Canada. single shot
See the link below to see what Daisy has to offer.
No such model number in the Winchester line.
1940 is turing year of cooey model 840he manifat
Try Proofhouse.com
1962 TO 1966
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 you mean the model 340,not 840?If this is the case,the model 340 was made from 1950-1985,the model 340C was made from 1952-1960,and the model 340V was made in the late 1960,s.The model 340S was made from 1952-1960 also.
Best left to a gunsmith