Watch List notes:

Constantine II caesar, 316 – 337. Solidus, Sirmium 321, AV 4.33 g. D N CONSTANTINVS IVN NOB CAES Laureate, draped and cuirassed bust r. Rev. FELIX PROC – ESSVS COS II Prince standing l., holding globe and baton; in exergue, SIRM. C 107 var. RIC –. Alföldi 127 var. Depeyrot 4/2.
Exceedingly rare, apparently only the second specimen known. A minor edge nick
at nine o'clock on obverse, otherwise about extremely fine

Ex Leu 77, 2000, 675 and NAC 52, 2009, 615 sales.