The West Virginia Hollenbecks share the bolting patent with the Baltimore Arms Co. guns. The cocking system, in the Hollenbeck signature 5/8 inch wide barrel lug, is very different in the Baltimore and the West Virginia guns. Frank's patent for the lock mechanism, including this cocking feature, used in West Virginia, wasn't granted until the Hollenbeck Gun Co. was belly up, but I've never seen it stamped on any Hollenbeck/Three-Barrel/Royal Gun Co. guns.
Cherry's also have twelve Three-Barrel Gun Co. drillings on there list. Looked like every one has "issues" to my eye.