Marlin Model 120?

[Hammer]

looking for a little help as to what i have inherited.

This is a 12 guage 30" Plain barrel 2 3/4" - 3" with Marlin Model 120 on it.
The Reciver is whats thorwing me off.... there are NO Markings on it other that a SN with an A prefix.
All of the others i have seen have either Marlin 120 / Glenfield 778 then the SN
It has a Marlin Emblem on the stock below the grip.

Dont have any Pictures at the moment but can post at a later date if that helps.

Also can someone give me an Estimated Value? It Appears to be in unfired condidtion.

Thanks

[chrifle]

there should be no markings on the receiver except for the serial number; the model number is on the barrel rollmark. If you post the first digits after the A, we can determine the year of manufacture - these are heavy, but very nice and well made shotguns.