Not much, $100 to $120.
50-150
No public sn data available
Best to ask a gunmsith for assistance
the western auto model 120 was made by marlin.The marlin model 99 was made between 1959-1960.
i belive that people should always ansewer this question
50-100 USD
Reliable and solid performer
Numrich Arms is a good source for gun parts.
I presume you are asking about a Marlin model 120 pump action shotgun. In good condition a standard 120 is worth about $200-$250. If you are asking about The Revelation model 120 that was manufactured for Western Auto Supply by Marlin, then you are looking at a generic model 60. Worth about $75-$125 dependent on condition.
50-115
Good good gun very accurate