During my research on SS 16520 models, I found many great sites (here, drsd, & daytonainfo to name just a few) with various details about Mark I to V variants and the watch itself.
Most of the web sites listed 5 dial & 3 bezel variants. A few more Marks have been identified and I just wanted to share some info.
The link below does a decent job summarizes each Mark including the new ones. note: bezels aren't listed but only 1 new variant has been ID's (the same one found on earlier 116520s).
Rolex Daytona 16520 Dial References/
note: i also put some here info.
https://www.rolexforums.com/showthread.php?t=707709