Hey guys notice the small chrono rings (square) on the two blues: one is silver one is whitish. Also date wheel different colours.
The date ring colour is quite a common thing with Zeniths. The best examples are the Class 4 models where the ring is white, black, copper or blue, depending on the dial colour. Unfortunately, the blue and copper ones are not available any more and you see a lot with a wrong date ring.
My watch now has the supposedly correct black rehaut (inner bezel): I like it better than the grey one, which one of my predecessors ordered: Cheers, Mick