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Actually, it's an Israeli cartridge designed by IMI for the Italian market. It's full name is the 9x21mm IMI.
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Now you mention it, I recall accounts of its development.
At first IMI said they would make a lengthened 9mm P. The Italian version of BATF said that was insufficiently non-military.
So IMI said, How about we neck up 7.65 Luger to 9mm (and trim a bit.)
Italians say OK. Even though the end result was the same cartridge.
That worked in the Beretta and other 9mm platforms.
And good luck finding any of IMI manufacture, Fiocchi seems the only source.
Colt went the other way. You will occasionally see a Commander in 9mm Steyr; which is a straight cased 9x23; pretty much a rimless .38 Super.
I guess the Italians had forgotten the Steyr Hahn of WW I Austrian issue.