Your western field 822 was made by mossberg firearms company.the model is mossberg model 640K.I would start by cross reference the scope mounts for the mossberg 640K.Good luck!
1959-1960
I would start my search at Numrich Gun Parts Corp.They may be found on the web.
The m822 is the same as a mossberg 640. The clip is available from G-C Gun Clips Inc, PO 4, Viola Idaho 83872. Phone 208-883-4552. Price is $30 shipped.
Your westernfield model M822 was made for montgomery wards(westernfield) by mossberg gun manufacturing company.The mossberg model designation for this gun was the mossberg model 640K.these were made by mossberg between the years 1959-1984.
No published sn data
The WesternField brand was made by Mossberg, and the value of a M822 .22 WMR is between $200 and $250 depending on condition. I purchased mine last year and it was in "very good" condition (95%) with no rust or damage to the wooden stock. It came with a scope, gun case, and 3 mags all for $240. Shoots great but occasionally the empty shell case gets stuck in the barrel and won't eject properly. This normally happens after the gun has been fired alot. Dirt builds up in the barrel and behind the extractor. A good bore cleaning and polishing makes it like new again. I got to stop shooting cheap ammo that fowls up the barrel so badly. I carry a pair of bent needle nose pliars to grab the rim of the shell and pull it out.