Try local gun shops, gun shows, Shotgun News, Gun List, etc..
I can't tell you what it worth but My catalogue says it's a Mossberg 500E made by Mossberg.
Made for Western Auto Stores. Proofhouse.com has a store brand chart.
Your western auto model 312AA shotgun was made by mossberg for western auto.The mossberg model 395,395K are the mossberg model designations for your shotgun.
NO! The 1187 barrel was for remington shotguns,the auto-5 shotgun is a browning shotgun.
Your revelation R310C western auto shotgun is a Mossberg model 500C which was made by Mossberg and Sons for Western Auto.
Which Model?
Check the receiver and barrel
Should be marked on the barrel
Your Browning auto-5 shotgun,which was made in Belgium in the year 1953 will bring between 350-550 dollars,depending on overall condition and a good bore.The type of barrel your shotgun has will also determine the value with a plain barrel bring less and a vent rib barrel bringing more.
Model 24 is a semi-auto 22.
50-150 or so
In order to answer your question correctly,I would need the maker of the shotgun,shotgun model,and type of shotgun we are talking about(pump action,single shot,semi-auto etc.) I would also need to know what type of barrel you have(plain barrel,solid matte rib,or vent rib barrel).also include the overall condition of your shotgun and amount of blueing remaining on the receiver and barrel.