Watch List notes:

Auction 88 Part I
The Roman Empire
Diocletian, 284 - 305

Aureus, Cyzicus 286, AV 5.30g. IMP C C VAL DIOCLETIANVS P F AVG Laureate, draped and cuirassed bust r. Rev. IOVI CONSERVATORI ORBIS Jupiter standing l., holding thunderbolt and sceptre. C 282. RIC 299. Lukanc 14. Dep. –, cf. 2/3 (Jupiter holding Victory). Calicó 4525 (these dies).
Struck on a very large flan, minor marks, otherwise virtually as struck and almost Fdc

Due to it heavy weight we decided to date this coin in 286 after the monetary reform of Diocletian that increased the weight of the aureus from 1/70 ounce to 1/60 ounce. Interestingly, this is only the second heavy specimen to be recorded for this type.