Proofhouse.com has a store brand conversion chart that might help.
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.
Mossberg
savage made this model,orig model is a 77
It was made by Savage for Coast to Coast. It is a Savage Model 58.
Savage Stevens
Being that you said auto shotgun,then you have the Browning auto-5 shotgun that was made by FN in Belgium from 1903-1975.Your serial number indicates that your Shotgun was made in the year 1938.
Stevens, as their Model 94.
$250
This gun was made by Savage/Stevens as the Model 77. Made between 1955 and 1971. Value depends on condition, but it will value between $100 and $175. A Coast to Coast mod 267 is a Savage mod 77. The value will depend on condition. Have it assessed by a gunsmith.
Odd question... It's a auto-loading shotgun made from 1905-1947, actually it is the FIRST auto-loading shotgun produced in the U.S.A. !
your browning model auto-5 shotgun was made in 1924.
If your shotgun is chambered in 12 gauge,then your shotgun was made in the year 1913.If your shotgun is a 16 gauge model,then it was made in the year 1926.