Gentlemen / Tom,
Could you expand more on the markings on the weapon itself? Who would be more inclined to stamp FULL over CYL and insert the "4" (factory marking FULL). Why would Ithaca (the most likely suspect) do this? It supports more of a theory that a factory exigency for shipping to military? Also what is the star stamp near barrel threads?

It doesn't seem if it started as a CYL (civilian or police) would put factory "4" on.

The heat sheild looks as weathered and as worn as gun. 6 row 29 hole. I think it's original but placed on after as well. Gun may have started life as riot gun and armorer upgraded in Vietnam?
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