Tetricus II, AV Aureus. Trier or Mainz mint. AD 273-275, 4.52 g. 

C P ESV TETRICVS CAES, bare-headed, draped bust right.
SPES PERPETVAE, Spes walking left, holding flower and
raising hem of robe. 

RIC V-2, 217; Cohen 83; Schulte 9a (this coin); Calicó 3932 (this coin); Sear 11280. 

With permission of Numismatica Ars Classica, March 2010.

Exceedingly rare, only a dozen specimens known.