It's correct for the era the dial is mimicking.
So ROLEX DID make the coronet similar to this version from CF. But the CF is still a bit to "skinny" in the middle part (over the bottom hole).
The same/similar "skinny" crown is used for the 116519LN from CF:
And here it also appears sometimes thick sometime skinny on the gens:
In contrast to that on the 116518 YG ... CF uses this coronet:
... which is really close to the gen one:
Well, I figured this all out of course after I ordered the grey 116519LN from CF (from TrustyTime at the end of July)... and in between I was a little down cause of that skinny coronet ... It hopefully will arrive in the next days (yup, waiting for around 2 months now
) ... and then I will see how this all appears without super detailed macro-shots ... and I guess/hope, it will not really bother me AT ALL