I'll add this post on to Eugen's, as they are both miniature Lugers...
This is the Marx cap-firing miniature, it's actually 3 3/8" long, comes in an aqua plastic 4" x 5 5/8" case. The 'accessory' section of the case actually came with three old [56 years?] rolls of caps.
Zinc cast metal with brown plastic grips, right half of cannon & upper frame assembly is a separate piece. Toggle actually works, but just two pieces, no separate breechblock. A coil spring inside the grip actuates the toggle, snaps forward to fire cap.
Marking on toggle - 'byf' and '53', 'MARX' on right side of chamber, '1253KG' on left side of chamber (I think), '53' on sideplate.
Dull charcoal color, doesn't look like it was ever fired. Satin finish.
Looks like it would be easy to cut the barrel off and fit a new threaded steel one. Drill & tap the frame for it, make up a set of wood grips. Scallop the toggle knobs. Fun mods.
Nah! Too much work! It's no Crottet, that's for sure!!!
(30 Luger cartridge case shown alongside for size comparison.)