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There must be exceptions or oddities for Ithaca. I have a 20 Flues, grade 1, made 1919-1920 by serial number which was made with 30" barrels which was not in the catalog at that time. Short chambered at 2 1/2" and choked full and full I have used it to good effect on late season doves.

I have a 1915 vintage No. 1 Special 28-gauge with 30-inch barrels --

[Linked Image from i.imgur.com]

The catalogs of the time only offered 24- and 26-inch barrels.