This was the one I was interested in. The Hi-Standard in .22 format was bought by the US military in 1941 to use to train troops on pistol warfare. In 1942 OSS was organized and bought 3,000 of them in silenced form. CIA later bought another 3,000 when it was organized in 1947. I carried one of these in Vietnam in 1968 over into Laos. I don't know whether it was OSS or CIA, probably the former. There were several at a base I often went to in Afghanistan.

Holt's did not actually claim this Hi-Standard was one of the OSS or CIA guns but they sure left the impression it might have been.
https://auctions.holtsauctioneers.c...++1052+&refno=++177904&saletype=
[Linked Image from i.imgur.com]

Unfortunately, it is not. (had it been, of course the price would have skyrocketed.) Here is an article I wrote for the Special Forces Association on the pistol.
https://specialforces78.com/wp-content/uploads/2017/08/0817-Sentinel-News.pdf

edit...and there is something odd about the angle of that magazine. No advertisement anywhere shows that.

Read ads carefully and Cavaet Emptor.