Watch List notes:

Constantine the Great (AD 307-337), AE Nummus (20.7 x 20.5 mm 2.79 g 6h), London mint, IMP CONSTANTINVS AVG, helmeted, cuirassed bust of Constantine left, spear over right shoulder, left holding shield, rev. ADVENTVS AVG N, Emperor mounted left, raising right hand, left holding spear, S and F in fields, PLN in exergue (RIC 2; CT 8.02.002 (this coin), extremely fine.
Ex Toone collection.

This coin is illustrated on the CT plate

(£300 - £500)