The last Marlin made shotgun was the Model 512 slugmaster,which was made from 1999-2001. After that Marlin made no more shotguns.
Either them or Marlin (1901 on)
The Marlin firearms company produced pump action shotguns from 1898(the Marlin model 1898)all the way up to 1985(The model 120 Magnum shotgun).during that time span Marlin made 17 different model pump action shotguns.
20 gauge marlin ou 2 triggers
This cannot be answered without you providing a detailed description of the shotguns overall condition,and the model of Marlin shotgun that you have.
Slide action shotguns with the name CHICAGO ARMS CO were made by the Marlin Fire Arms Company for and were sold by either the Fred Biffar & Co or Sears Roebuck & Co both of Chicago,IL. The gun is the same as Marlin Model 26A. Do not attempt to shoot this gun!!! Marlin has put out a company bulletin advising that these old Marlin slide action shotguns are not safe to shoot.
They were purchased by Marlin @ 1901.
1997-1999 for the Model 50 DL.
The O/U is made by Fausti in Italy and the SxS is made in Spain.
Check out a copy of Fjestad's Blue Book of Gun Values in your local library or book store. It will give you current values for old Marlin pump action shotguns.
Marlin Model 59 were single shot blt action shotguns that were produced in .410 only. Marlin manufactured less than 50,000 units. Value at 95% is about $150 to $175. I believe they were all choked in Full.
Marlin 31 is a shotgun. Marlin 81 is the rim fire .22.