Watch List notes:

JUSTINIAN I, (527-565), AE follis, Constantinople mint, (22.31 g) issued year 12 = 538-539, officina **D*, obv. Justinian bust facing, DN IVSTINI ANVS PP AVC, rev. M, **D* below, year XII, CON in exergue, large thin flan, (S.163, DOC.37d, BMC 43). Large flan, with brown/green patination, good very fine and scarce.

Ex Dr V.J.A. Flynn Collection and CNG Sale 75 (lot 159, that realised $360 US).
The first year of issue of the new large and heavy type folles.