The 16520 is a really nice Dayto.
The funny thing is that I prefer the 16520 white dial, rather than the 116 520 white.
As for the Back dial, I slightly prefer the 116 520...
Don't know why, but while comparing both of them...That was my first impression.
Till recently I didn't know that Rolex changed the vph on the Zenith ( for a 28 800 one ).
Very interesting, indeed.
Are you tempted ( once again...
) by a 16520 version?
Best,
Nicolas