Pictures are the easiest way to show the obvious differences between a CZ75 and the CZ75B model. They phased out the CZ75 when they came out with the "B". I am pretty sure you won't have to worry about finding a early CZ75 in Commiefornia as I believe they were never on the roster (somebody let me know if I'm wrong about that) and the only way one would turn up is as a private sale. Generally the early CZ75 and the pre "B" guns tend to bring a premium.
CZ75B on top and earlier model 75 pre "B" on the bottom, Both of these were made before the break up of Czechoslovakia on 1 January, 1993:

Obvious differences are the pre "B" has a spur hammer and rounded trigger guard. The serrations on the slide are different along with several more subtle differences in the frame and slide contours along with the slide release and decocker being shaped differently. In stock form, the grips are different.
In addition to the obvious external differences, the "B" model was upgraded with an internal firing pin safety.

This one is a transitional model commonly called a pre "B" as opposed to the first model CZ75. The pre "B" version is easily identified by longer slide rails and shorter slide-step than the earliest models with the heavily stepped slide and short slide rails. I don't have a first model CZ75, just the pre "B" and don't have an archived picture.



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