You obviously haven't seen a lot of custom guns...
(Angus is very close to the CZ factory, by the way, and a member of the CZ pistol team. He knows what's available, there.)
I think its a Boland gun, too. I have a Boland-customized AT-84S. Its has many of the features of your gun. And you'd think it was a factory gun, except factory guns aren't that nice...
Good gunsmiths can do that. They're artists. (Boland died last year, by the way.)
Notice the grips and mag well? It doesn't show in the photo well, but the grips are cut around the mag well just like on your gun. The grips look almost identical to those on your gun. Notice the redesigned slide stop and safety. The beavertail isn't stock, either... but you'd think it was. He also bobbed the hammer. And the trigger pull is exquisite.
I think your gun is a custom gun. Probably, as Angus says, a Boland. That's a custom fit BOMAR sight, too -- really strange way they're mounted, too, with a length-wise dovetail that precludes any other type of sight ever being mounted. <bleepit>