Whoever lost it will have been in trouble as these compasses were always deemed to be 'valuable and attractive' stores and as such an official enquiry would have been held. It's obviously a Britishicon, 70's onwards compass that's been converted to mils.

It's amazing how long they last and like the very old 'A' prefix ones we have here, speaks volumes for Army instrument technicians who maintain them. Is it still filled with spirit?