Here is an image of an apparently old (and for me, unknown) bread-slicing device from Richard Bertinet’s book “CRUMB” (2019, ISBN: 9780857835543, pg. 105):
What is this particular tool referred to as?
Baking Equipment – Old Bread-Slicing Tool
bakingbreadequipment
Related Solutions
It sounds like you may be missing a very important piece.
this
belongs here: 
Those are larvae of the Larder beetle, related to carpet beetles. Vacuum up all the crumbs and keep the area clean. They infest many dry foods and areas where food debris collects.
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Best Answer
I Googled for "Raadvad" which seemed to be the text embossed on the tool, and found this video suggesting this is a 'bread guillotine'. A subsequent search for "Raadvad bread guillotine" suggests either 'bread guillotine' or, simply, '(Danish/Scandinavian) bread slicer'.