The CH stands for Chinese contract. It's possible the OSS liked them but I should think they would want something small. Maybe silenced. The Hi Power was a favorite of many powers because it was a hi cap mag before it's time. The most of anyone. Germanyicon adopted the Belian model of 1935 when they over ran Belgiumicon. They will have Nazi proofs. An aquaintance of mine carried one and it's mentioned in the book Gathering of Eagles when he was guarding SS Geneal Kurt Myer. It says his revolver but he told me it was a Hi Power.

Anyway, it was and still is an all around favorite. It's a standard 9MM and will handle just about anything you have. I've had several and right now I have a Mk 3 in .40 cal. The buttstocks come available occasionally.