Looking at the two samples below, I believe that

• the dial should always contrast with the registers and the inner bezel ring. So we see the blue dial, with the white registers and white inner bezel . . . so if the color of the inner bezel matches the color of the dial, it is probably a replacement (bezel or dial)
• the inner bezel ring should always have the tachy markings, although the scales vary (in terms of the numbers shown), with 50 to 200 on the earlier models and 60 to 500 on the later models
• Note that the 1158 CH (gold version) is different, in that it has contrasting regsiters, but the inner bezel ring matches the gold tone of the dial

Jeff