Some more info:
According to the guy who brought the scope it, it had been in his brother's basement over 40 years. Also, the scope is exactly 1" aft of the turrets, but between the turrets and the front bell, it's only .940" in diameter. The ring does bear here, but not evenly.
Still no further ahead on this :(
Of course, it's also possible the scope has nothing to do with the military and was later meted to an altered Enfield bracket and tin. That said, the scope itself looks ruggedized and military-like in its build and robustness. It is definitely over-built and heavier than any commercial steel-tubed scope.