My guess is you will need to buy another gun just like it, and have spare parts. I have a 583.19 that was my Dad's first gun, circa 1950's, and his Dad and I refinished the stock in the 1980's. Either someone will carve one up for you, or you will need to buy a whole shotgun. Mine has a beautiful and in-tect red-rubber and black phenolic pad on the end, I consider this to be the hardest part to replace. If your stock is still essentially "there", have it correctly refinished by a smith. If it is missing all together, I think you are going to be in the market for a whole gun, maybe one with bad rust or mechanicals so you can made one good one out of two abused ones. If you are doing it just to sell, don't bother, sell your good mechanicals, the market for these is sentimental only, unless you have one of the European rifles.
No
Yes the stock on a Winchester Model 12 16 gauge is the same as a 20 gauge. 16 gauge,20 gauge, and 28 gauge are all the same for the Winchester Model 12. Thanks, Tim
No
I found a new unfinished one at: http://www.gun-parts.com/index.html/
12 gauge vs. 14 gauge metal
Try MidWest GunWorks and e-qunparts.com.
stock is standard american walnut, no stain.
That's not a serial number- it is a model number. Made prior to 1968. serial numbers not required- and cannot be dated for that reason. Sorry.
100-400 USD
Remove stock from shotgun
Probably not going to find an original stock in usable shape. You will have to buy one of the 95% inletted stocks available from companies like Boyd's and finish it yourself. sales@countrygunsmith.net
Any mossberg 500 stock will fit