Stevens-Savage 59B Shotgun - choke?

From the few older .410's I have seen, they are usually either cylinder or full, not usually much in between.

Easy way is just measure with a set of calipers.

Full Choke, .410, .396
Modified, .410, .405
Imp. Cyl., .410, .408
Cylinder, .410, .410
 
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