M. Plaetorius M.f. Cestianus Republican Denarius
Silver, 3.71 grams, 19.68 mm. Rome. 57 BC.  

Obverse: no legend, Head of Bonus Eventus right; arrow head behind.  
Reverse: M. PLAETORI CEST. EX. S. C, to left and right of winged caduceus.  
Sydenham 807; Crawford 405/5; Plaetoria 5; Sear 344.

Courtesy of CNG Coins, cngcoins.com, Sept. 2008