WW2 Australian Army Telescope M21 , the scope is made by M.H.R Co and dated 1942, checking Google these scopes were for the m2 75mm gun used on the American built M3 medium tanks used by the Australian Army in WW2.

This scope is in good order with clear optics and there are ranging crosses for 1, 2 and 3000 yards, and in the scope optics is a little 75mm written.

The scope is 225 mm long, 22 mm= 7/8" on the body and 27 mm at the larger end.

I have taken plenty of photos please enlarge the photos and note the condition the scope is in.

Thanks for looking.