The Jetfire is a .25. It's counterpart, the Minx is a .22 short. Fine little guns!
Astra made the Cub in .22 lr in later years. I don't know the length as they were not imported to the US. Bernardelli made a very small auto in .22 short and .22 long, but no LR.
Armi Galesi made a small .22 lr about 5 inches long.