Don't forget either an M48 (Bausch & Lomb) or an M49 (Argus) military finish spotting scope from WWII, with fiberboard case, and an M14 or M15 Tripod, also in appropriate case! Or a pair of same vintage USGI issued binoculars.
The M48 was also first known as the M4 and some are so stamped (pre-war, as the Civilian B&L "NRA Model" and was war early issue - and much harder to find. By the end of WWII, the M49 had taken over, although you will find plenty of pictures of M48s in use during the war. Standard eyepiece was a 19.5 on the M48, with 13X and 26X eyepieces available - I have a Marine Corps issue M48 with the 19 and the 26 power eyepieces in the fiberboard case.
The M49 soldiered on into at least the 1980's/1990's. A lot easier to find. CC
Colt, Glock and Remington factory trained LE Armorer
LE Trained Firearms Instructor