Not a Shield, but a Patera

Frugi’s coin is clearly a patera and part of the priestly implements (RRC 418):

Now lets look at an under appreciated coin from much earlier RRC 271

Same rendering.  Same object.  EVEN the same type of wreath!  We now much put Cavedoni‘s idea that it might be connected to the lex Acilia back on the table which Crawford threw out.  (I find myself relieved that he also makes the Piso Frugi parallel!)