Augustus, AV aureus, ca. 19 BC. Moneyer L. Aquillius Florus. 8.19 g. 

L AQVILLIVS FLORVS III VIR around triskelis with winged Medusa head in centre and with winged legs.
CAESAR AVGVSTVS above and beneath oak wreath with a laurel branch to left and right and O C S in the centre. 

RIC I 302; Babelon Aquillia 14; Cohen 356; Bahrfeldt 173; BMC 35; Calicó 124 (this coin); Biaggi 156 (this coin). 

Very rare, less than half a dozen recorded.

With permission of Numismatica Ars Classica auction 54, Lot 295, March 2010