I saw one once listed as case knife or something like that. I wonder whether they're just promo items or they actually are/were intended to be used as case knives...
I use both Leatherman Sidekick and a Victorinox Camping as my case-opening knives - the Victorinox can be a bit finicky, as both blades can snap back, but it is easier to slide it into case back gaps.
They are made as case knives and regular blade knives. Both are made to be used as openers as well. Both are promotional and made for several watch companies. Both Wenger and Victoinox made these. Wenger is now part of Victorinox. Some old watch co knives were made by other manufacturers.
There are more on eBay now... I'm going to cherish the one I have and not try to get all there are... so go nuts, bidders! And no, not my auction. Tom