Nero AE Sestertius. Lyons, 66-8 AD. 

Obv: IMP NERO CAESAR AVG PONTIF MAX TRIB POT P P, laureate head right 
  with globe at tip of neck 

Rev: S-C, Roma seated left above cuirass & shields, holding Victory & parazonium, ROMA in ex.

Very rare variant, possibly the second recorded or even unique if this is
the identical Greau coin quoted by Cohen.  MacDowall, Coinages of Nero,
p.279, RIC 217, found no specimen of this coin to confirm Cohen's
description, and it was omitted by Sutherland in the second edition of RIC
vol. 1."  Marked $2000 (was at a higher price initially).
The coin weighs 27.7 grams and is 36.7mm at max dimension.

Asking $1400 for the coin.

Contributed by Richard Beale.