Dralowid
Michael
farlymac
PF McFarland
I've seen one before a long time ago, so this is obviously a copy, though maybe not exactly as the one I saw. It wasn't a Leica option, and made to fit for other cameras too.
PF
Vince Lupo
Whatever
Yes looks like an Accu-Rapid.
aoresteen
Well-known
Bingo! That it is!