It appears that the earlier guns were not marked, then came fractions, and finally single digits, if we can go on 6 guns.
184xxx no choke mark. 20 ga
201xxx no choke mark 20 ga
210XXX no choke mark 28 ga
216xxx 4/4 4/4 28 ga
232xxx 0- 4 28 ga
241xxx 1- 4 28 ga
257xxx 0- 4 20 ga
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