Beeman sold those over here in the colonies. The barrel unlatched from the breech and I believe you cocked it by pulling it up and forward. Lots of power, but accuracy was not minute of angle.
A powerful pistol for its time, according to Dr. Beeman’s catalog which I received back in the early ’70’s.
A lot of people felt that way about Webley spring pistols.
Hoot 😯