Freeborn PT-10-020. 6-piece set, 4” diameter 3-wing cutters. No fence adjustment needed between cope and stick passes. 1-1/4” bore, tungsten knives for cleaner cuts on hardwood, 1/4” x 3/8” tongue, good for material from 3/4” -1-1/8” thick. Lightly used. This set lists for over $600 new. Yours for half that.
Note that one photo depicts the printed info included at the factory, which shows the quarter-round profile, not the ogee—either sets of knives can be rearranged to cut standard cope and stick, glass, or tongue and groove joints.