Rummaging through my files last night I discovered that Parker Bros. were actually advertising a .410-bore Skeet Gun by October 1933 --
.410-bore Skeet Gun ad October 1933, Field & Stream.jpg
.410-bore Skeet Gun, October 1933, Fireld & Stream.jpg
and Capt. Paul A. Curtis reviewed it in
Field & Stream.
The Winchester Model 42 and the 3-inch .410-bore shell had been introduced and reviewed in the July 1933 issues of a number of sporting magazines.