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

grade 3 Lewis 12 ga---no markings
grade 4E 16 ga 4 and 4

Here is why I was asking......it is a 1915 vintage Flues 12 gauge with 28 inch barrels. I should have it in-hand in a week or so. It will be my first Ithaca. I just have to get used to not having a curly-Q thingie(?) behind the rear trigger!

them ithacas are great guns and in the lower gauges not to bad on the pocket book..one good over looked gun is the ithaca heavy field..the chambers on it are 2 7/8 inch it handles 3 inch shells very well this is 12 ga i m taking about...ant way there good guns...charlie

It looks like it's in great condition!
They are nice guns.

Not Parkers, but still very nice guns.