Not pertinent to Parkers, but I own a 1907 2E Smith that has 3" chambers and is so stamped on the barrel flats. In addition, I know of a higher grade post-'13 Smith made in 1914 that also is a 3" gun and has the factory "football"-shaped 3" stamp on the flats.
Thanks to Destry I also have 3- 3" 16 ga. shells---2 Peters and 1 Ajax. From memory, 3" 16 ga guns were fairly common around the turn of the century on the Continent, so I suppose the major domestic manufacturers offered the chambering as well, though uncommon.
My 2E is my "go-to" gun for doves, and recently provided me with a limit of mallards over decoys using Hevi-shot Classic Doubles.
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