I've had a couple of them. They're not the same as the current CZ offerings. The non-ejector model is the ZP-47 and the ejector version is the ZP49. Both are true back action sidelocks with hidden third fastner. The springs are coil rather than flat, but that's not always a bad thing.
Lots of'em are here as GI bringbacks from cold war stations in Europe, and folks like Sarco in NJ and Kebco have imported many more. I had a 16ga that was just as you described and a 12ga ejector, and liked them very much. I sold both mine to another poster here a year or so ago for $400 each. Hope that helps...Geo
