PB Tessera, 19mm. ca 81-161 AD, Saturnalia celebration. 4.54 g.

Wreath. 
IO SAT IO in two lines with palm branch between, with stalk 
split into two horizonal lines, forming an upside-down F.

Paris 103. 
Very rare.

With permission of The New York Sale, V Lot 250. 
Sold for $175