Leo III the Isaurian, AD 717–741. AV tremissis, 16 mm, 1.24 g. Uncertain Italian mint,

D LEON P T, crowned facing bust, wearing chlamys and 
simple crown, holding cross on globe and akakia.
VICTORIA, cross potent. Mintmark CONOB.

Sear 1540 var (obv legend). 
Very rare.

With permission of Heritage World Coin Auctions, September 2013.
Estimate: $1,000-1,500.