It’s an attractive looking gun.
That looks like the smaller of the two models (same as the Iver Johnson version). It was about the size of a .25ACP handgun.
I once had an RX-22. It was the same size as a Walther PPK (NOT the PPKS), thus a little larger than the one shown. I got it as an understudy for my PPK in 32ACP. That was before I started reloading .32ACP and the .22LR was much cheaper.
The slide was a zinc casting. After only about 1,000 rounds or so, the ejector (not the extractor) became hammered over and it refused to eject. No way to repair it. I sold the reusable parts on eBay for about what I paid for it.
Iver Johnson made well built guns. Motorcycles, too, for a while.
As an historical note, an Iver Johnson revolver was used by McKinley’s assassin, and I think Sirhan Sirhan used an Iver Johnson to kill Robert Kennedy.
Stationed in Italy in the 70’s I was allowed to privately own handguns in a “non-military caliber. No .380, 9mm or 45 but I could carry or own a 44mag, a 357 mag, or .22 long rifle.
My daily carry was a Beretta 70S auto in .22 long rifle w 3 spare mags and / or a SW 4” model 19 with 12 spare rounds in my pocket.
Red Brigade and Bader Meinhoff were our threats back then.
I had one of the Ivers with the black plastic grips, nice pocket pistol. Never malfunctioned. $125 in 1986.
I had a Walther PPKS in 22lr that looked exactly like that. Sold it for $600 back in ‘03. It was too nice to carry.