That compass and the leather case don't look deep enough to be the UKicon Military type. Ours were about 1.25" deep including the prism cover (the bit fixed to the lid that covers the prism assembly when closed down.....) Or is it camera angle distortion?

Anither bit of 'supplementary issues' for the sniper rifle CES incidentally.

I taught my son to use one while he was very young and he can still use it to orient the map, back bearings and thereafter read the map. Good and VERY useful bits of kit. Mind you, not the sort of thing that you'd ever entrust an Officer with. That and a map!