Compass on a whip handle
Several years ago I wrote about a whip with a compass in the handle : Read more here

So, I was pleased to find this Champion & Wilton saddle flask with a space in its lid for a compass :

Champion & Wilton saddle flask

Champion & Wilton flask

Champion & Wilton were a prestigious company of saddlers, famous for sidesaddles, but I wonder if this flask was a military officer’s private purchase.
There are more details at http://www.sportingcollection.com/attire/flasks/flask018/flask018.html