The
SKEET-ER doesn't appear until after the 1931/2 Iver Johnson catalog. Up to the 1924 IJ catalog the Hammerless Double is only offered in 12-gauge, but some 1924 catalogs have a paste-in adding 16- & 20-gauge and .410-bore.
Hammerless Double Barrel, 1924 catalog with paste-in.jpg
By 1927 they also offered ejectors --
Hammerless Double Barrel, December 1927.jpg
and the 12-gauge vent rib Super-Trap --
SUPERTRAP 12-27 02.jpg