These do not seem to have a lot of collector value - even really nice ones seldom bring much. They are a more streamlined version of John Browning's design that became the Steven's 520 and are basically the same gun mechanically. These are very smooth working and very dependable guns.
The 620 first appears in Stevens catalog #57 and is on a price list dated Jan 3, 1927 - it could have been on an earlier dated price list because the trap version, 622, is already listed a discontinued on this list.
In catalog #58 the old hump-back 520 is shown but my copy has it over stamped as discontinued - it had first appears about 1907~1908 in catalog #53 Revised Edition.
The model is not listed as a 620-A in any Stevens catalog up to #43 with a price listed dated March 7, 1946 - this is probably the last seperate Stevens catalog. (The catalog numbers started over again with #40 in 1940 which is why the earlier catalogs have higher numbers.)
The Savage, Stevens, Fox catalog of 1955 is the last I can find with the 620 - still no 'A' so it appears that they never listed that change in the catalogs.
Last edited by GeneB; 12/26/11. Reason: added info
