There are also differences between the Rolex 16550 vs 16570
According to an expect,
1. Real cream dials have to be Rail dial...
2. The bottom four lines have to aline in this way:
The 2 C's have to line up. If it does not have that it's not really 16550 cream dial.
3. Cream dial with the correct fat font bezel:
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However, here are much debates from the web...