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...I haven't searched the non-Californias, perhaps you mean the 721 is the only one? Cheers.