Has anyone ever seen this?

[Dean Romig]

Originally Posted by Chuck Bishop

Agree Tool Man. It's probably an aid to sighting similar in function to the V found at the breach end of a Parker vent rib. But again, if your eye height above the stock is not changed up or down, and the muzzle end of the rib or front sight is not moved up or down, then your POI will not change no matter what device you add to the rib. This assumes that the height of that device still allows you to see the front bead. If you can't see it and have to lift your head (eye), then the gun will shoot a higher POI.

BTW, you haven't aged a bit!

Chuck.... you're a dedicated trap shooter, I know. And as such, you adhere to the proscribed tenets of what must be done in trap shooting to be a consistently successful shooter.... and one of those tenets is to keep your cheekbone pressed to the comb. And a dedicated trap gun has pretty straight dimensions - in any case, a lot straighter than this little gun.
This 28 gauge Ithaca wasn't made to be a trap gun - it was made as a game gun - an upland gun most likely. In those days a hunter would most likely have kept his head more erect and would, upon the flush, have brought the gun up to his line of sight - - - and that's the point of this little device - to more precisely direct his line of sight with the front bead a bit more elevated than the breech end of the barrel rib.

I don't know how I can explain it any better than that.