IIRC, although Savage/Stevens didn't mark the chokes on many of the shotguns they produced, they standardized the SxS chokes by barrel length.
In 12/16/20 ga, AFAIK:
26" bbls = IC/MOD
28" bbls = MOD/FULL
30" bbls = FULL/FULL
I think the .410 choke setups might have differed.
Any Savage/Stevens, manufactured between 1949 - 1968 should have a small circle with a number and letter stamped between the trigger and the hinge pin.
The letter reflects the year of manufacture.
A to N = 1949 - 1961
P = 1963
R to V = 1964 - 1968
The Model 311 has been in production since at least the early 1930's - the Model 5000 it's precursor, not the Model 5100.
The Model 5100 was a Model 311 variant.
The "Springfield" brand was used by Savage until very recently (I bought a new Springfield Model 187 .22 in 1966 for Christmas) - and always on their lowest grade price leaders, generally manufactured for bulk orders.
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