uncommon belgian bread knife with arm support

[fernando]

Originally Posted by junker

Just a guess.
Maybe a knive for one who lost his hand, when it is fastened to the lower arm...

Humm ... unlikely (see my profile). I don't see much praticality in that. Besides, prothesis and other straping devices are only word to put up on a permanent basis, not for ephemerous tasks.
On the other hand, that arm 'rest' is well placed as a stopper to back the effort you would have to make to cut something hard ... very dense bread, following tim's mention; otherwise something harder .