Watch List notes:

The Roman Empire

Constantius I Chlorus caesar, 293 – 305. Aureus, Treviri 293-294, AV 4.90 g. CONSTA – NTIVS N C Laureate head r. IOVI CONS – ERVATORI Jupiter seated l. on throne, holding sceptre and thunderbolt; at his feet, eagle with wreath. In exergue, PT. C 156. RIC 19. Depeyrot 1A/4. Calico 4847 (this coin).
Rare. A very unusual portrait, several minor marks and slightly
bent, otherwise about extremely fine

Provenance
Ex Rollin & Feuardent sale 25-30 April 1887 (Ponton d'Amécourt), 634. Viscount Louis de Sartiges (1859-1924) Collection sold by Ars Classica, Lucien Naville expert, auction XVIII ("Un diplomate étranger"), Lucerne, 10 October 1938, lot 493.
Sold by Busso Peus Nachf., Frankfurt a/M, auction 357 (Spezialsammlung römischer Münzen aus Trier), 28-30 October 1998, lot 863.
Sold by G. Hirsch Nachf., Munich, auction 279 (Die Generationensammlung), 8 February 2012, lot 2765.
From the Leo Biaggi de Blasys (1906-1979) Collection, bought by Bank Leu and Marco Ratto in 1978. 
This example published in D.A. Longuet, Collection du Vicomte de Sartiges. Séries grecque et romaine, en 1910, ainsi que les acquisitions depuis cette date, [Paris c. 1910], no. 412; Biaggi cat. n. 1834