This compass belonged to my FIL. It's one of the items recently unpacked from moving boxes. It was either from an airplane or a boat. Leo worked for Grumman Aircraft and he also had built his own boat, so... I'm sure my husband knew of its origins and he probably told me at one time. But, today, the story is lost on me.
It is stored in a very nice wooden box.
Update: My son says it's a nautical compass, so it must have been in Leo's boat.