At a quick search among the California dials, we can find at least three more references: PAM 629 (a limited edition of 300 from 2015), ref. 718 (50 pieces from 2016), and ref. 448 (750 pieces from 2012). So maybe now the topic is a bit less interesting.....
has an anonymous dial. The conclusion could be that the California dialled models are prevalently (if not all) anonymous, whereby the 721 is the..only..other Panerai with an anonymous one.
From what I was able to find, the 721 does indeed seem (essentially) the only recent Panerai reference with a non-California, anonymous dial. To be precise, there exist a few other "anonymous" references, such as the Pam 350 and 528 (pictures below taken ...
also playes a part here. On the skeleton models there is just no space for any..scribble..and as a consequence they are..anonymous. On the Scenziato they found some space on the inside of the bezel, on the 528 there was not even space for that I believe t...