The magazines were made in Italy for companies like Bingham & Armi Jager during the 80s for several of its .22 rifes which were primarly 22lr copies of larger rifles such as the Galil, pphs, thompson, ect.
Along the way several small compaines in the US, such as Taylor produced an adaptor for the 10/22.
When the magazine ban came along Ciener bought all the magazines in the US and will not part with them.
These magazines are not common in their orginal format (Such as yours), most have been altered with welded adaptors and can not be used in more then one gun.
The small number that did not get picked up by him are what you have and are highly sought after if you have the adaptor that goes with it. And in your pic you have two adaptors!
I have set a of 6 magazines, the speed loader (most of the time this is missing from the set), and the adaptor myself. I had to dig deep to find them to...
There was a set on gunbroker the other day for $400 (4 magazines and 1 adaptor I think)...