M. Aemilius Lepidus with L. Mussidius Longus. AV Aureus, 42 BC, 7.97 g.

M LEPIDVS III VIR R P C, Bare head of Lepidus left.
L MVSSIDIVS T F LONGVS IIII VIR A P F, Mars standing right, wearing Corinthian helmet, holding sword and spear, resting left foot on shield. 
Babelon Mussidia 10 and Aemilia 38; Cohen 2; Bahrfeldt 50a; Sear Imperators 161; Calicó 75 (this coin); Biaggi 58 (this coin); Crawford 494/7b.

Very rare.
With permission of Numismatica Ars Classica - Auction 83, Lot 463, May 2015
Estimate: 100,000 CHF