The IJ Pony´s, as well as the Colt Mustangs, are copies of the Star DK and DKS Starfire.
My Father has one, I had one.
Very small pistols, reliable, quite accurate.
But they hurt just as much on the rear end, as on the front one!
I even bought a thick leather glove for training … then found a better solution:
Got a Glock 42!
There might be even smaller 380´s, BUT:
it´s thinner, shorter and lower weight than an Aluminium PPK, and 380 vs 32 ACP caliber.
I LOVE mine!
Hermann