My guess is that it is a genuine CYMA dial, but possibly a later replacement.
The 1 index is spaced evenly between the two adjacent ones. If the bottom were to be aligned with the printed index, the spacing would look off.
I own a few of these, and the only issue with the one you show is that the "Chronometre" signature appears to be a touch thicker than normal. My guess is that it is a genuine CYMA dial, but possibly a later replacement.