This one, made about 1916, is in a hunter case, but the front cover has been broken off at some point. The inside is engraved so the watch was no doubt important to someone. They fit the front with a think crystal, as would be found on an open face watch case, so that the watch could continue to be used. I have only seen this sort of fix one other time.
Hunter case crystals are extremely thin and fragile - like egg shells. It is a common misconception that hunter cases are more durable than open face cases. This is very much not so.