Hawthorne was sold through Montgomery Wards. The 820b is actually a Mossberg 320b sold under the Hawthorne trade name. Book value is $20 to $100 US, but they are great little rifles.
Your Hawthorne Warrior M820B is in fact a Mossberg model 340, of which there were various designs. A lot of the parts are available through e-gunparts.com. But, be careful, and ask a lot of question when ordering parts. A lot of the parts are not a direct fit. I have a Mossberg 340KA, and had to replace the barrel. I ended up with a barrel from a Hawthorne M820B. The sights on the Mossberg barrel were dovetail mounted, and the sights on the M820B barrel are mounted with screws. That's just an example. This will get you started in the right direction.
The Hawthorne Warrior M825 .22 LR was sold by Montgomery Wards in 1957 and 1958. It is actually a Mossberg Model 140 rifle.
Mossberg Model 340.
It was made by Mossberg for Montgomery Wards. It seems to be a variation of the Mossberg 146. There was also a version sold as the Hawthorn Warrior M820B.
The Western field model M820B was made by Mossberg for Montgomery Wards.The Mossberg model 340 is the same firearm that you have.these were made between the years 1958-1980 by Mossberg.
Colt
Looks like Savage built them. Their model SB100B. Hawthorne model name was "Vulcan". Parts are available from Numrich Gun Parts. Good to see someone else owns one.
Compare to a known dated model, Blue Book of Gun Values.
No sn data available.
50-125 USD or so
Mossberg made most of the Hawthorne bolt action shotguns. They were sold as a Montgomery Wards special.
Warrior control arms from model years 1987-2004 are interchangeable with the 1988 warrior. Make sure the control arms come from a similar era model to ensure proper fitment and compatibility.