I'm replying to this old, interesting
thread, because I've just acquired the following AE As by Q. TItius with symbol (palm-branch), with a rounded-beard
Janus obverse. This is
Crawford 341/4d, and Crawford's related table identifies the palm-branch symbol variety with reference to an example at the
Kestner Museum
Hannover.
Hannover 2942 (
Berger) is from the same dies, with rounded-beard.
ACSEARCH yielded only two other examples of the palm-branch symbol, both with typical (for Titius) pointy-bearded
Janus heads.
Round-bearded
Janus, of course, is associated with Pansa's coins. Titius'
Asses overwhelmingly bear a pointy-bearded
Janus. I wonder if these apparent
obverse die mix-ups are the result of a common die repository (between shifts) doling-out the wrong pairings at the beginning of the next shift.