mine has no model numbers or the Junior  stamped on it.  It is 1.08 inches thick. it has the tapered transfers screw under the barrel with a lever to unscrew it. there is a screw going into the transfers screw hole, I assume to lock the screw into place. it has a hooked Schutzen type but plate no rear barrel sight and an adjustable tang mounted sight with a flip peep hole large and small. The pistol grip stock is rounded at the bottom like a Hepburn stock and has the same checkering pattern as a Hepburn. It does have Hopkins and allen for merwin and Hulbert stamped into the barrel  and 22rf just in front of the action.