It doesn't have the firing pin block (which is the little cylinder on the underside of the slide); that little piece would be visible in the shot of the bottom of the slide. the BLOCK is what the "B" stands for in the 75B models.
The pin through the slide (on the 75B-based models) mentioned earlier, is the firing pin block retention roll (or now, solid) pin. The older CZs, like this one, had a firing pin stop -- a plate at the rear of the slide.