Watch List notes:

Constantine II. Gold Solidus (4.36 g), as Caesar, AD 317-337. Sirmium, AD 324. CONSTANTINVS IVN NOB CAES, laureate, draped and cuirassed bust of Constantine II right. Reverse: FELIX PROCESSVS COS III, Constantine II standing left, togate, holding globe and scepter; SIRM. RIC -; Depeyrot 9/3 = MMAG FPL (December 1983), 50. Possibly Unique. Extremely Fine.
If this is the same coin as the MMAG specimen cited, which unfortunately we were unable to confirm, then it is unique with no other specimens known. Estimated Value $6,000 - 7,000