I've owned Model 520 12ga (early style receiver) w/solid rib, checkered pistol grip stock & forend,,trade name marked Montgomery Wards.
Standard field gun marked 'Model 520-30' (later style receiver) 12ga 30" Full w/ Stevens, Chicopee Falls markings. Just sold that one last year.
Early style receiver 520 12ga w/ hang fire safety mechanism. Only one with that feature I've ever run into. I think these were very early in production, but just my guess.
Counter weight that is just barely visable from the bottom. In a cut in the inner left rec'vr wall, rear of the carrier.
Otherwise you'd think the bolt lock/release isn't working.
Late style 520A 12ga field grade w/ factory installed adj choke.
3 position choke. End of bbl was swaged slightly for installation. I've seen a few others as well.
These had Stevens markings on them.
Some guns have choke markings, some have the choke designation done with (*). Some don't seem to have choke designations at all.
Some in 12ga are not even gauge marked.
Some carry a 'Browning's Patent' marking on the bbl, others not.
