And 5550P has the same type of numbers than 5140.
But: that's how the watch was made, as simple as that. I am sure that all 300 owners can find a a small detail they would like to see a bit differently. However, our right is to apply the watch as it is produced or simply forget that. I did not much like the way the dial of the Anniversary Nautilus was executed. What I did was not to apply for those watches and focus into something else.
For me 5370P is as close to perfection and my taste as any watch can be. However, even in that watch I would like to change something - the price tag.
You are right; the vertical grain of the dial of 5550P is simply amazing.
Best, Kari