It should be in the right side of the receiver, (small numbers)
The Stevens Savage Model 124 12 gauge shotgun was made from 1949 to 1954. The serial number will signify the actual year of manufacture.
Dating a Stevens 12 gauge model number g20a and serial 12202 is best done by the name on the gun. Where only Stevens appears the gun is likely made between 1940-1991.
That is not a model number, but is likely the serial number. Unless you have a Model 620 US marked Trench Gun, Stevens pump shotguns have little collectors value.
Stevens Model 9478 shotguns generall sell under $100. sales@countrygunsmith.net
The Stevens model 77E was made from 1955-1971.
about £120
I have a model 167 series E and it is a 12 gauge up to 3" magnum
The exact value of a Stevens 12 gauge model g20a is actually dependent on a couple things. Some of these things would be the age and condition.
Try e-gunparts.com
Whats it worth?
50-200
My dad and I bought a Stevens Mod. 940 single shot 16 gauge at a hardware store in 1950. model # 940