Watch List notes:

Constantine I. As Caesar, A.D. 306-307. AE follis (27.5 mm, 5.81 g, 7 h). Trier mint, struck summer A.D. 307. FL VAL CONSTANTINVS NOB C, laureate, draped and cuirassed bust of Constantine I right / PRINCIPI IVVENTVTIS, Constantine standing left between two standards; S-A across fields, PTR in exergue. RIC 735. Fair, pitted and rough. Very Rare.

This might be the ugliest single lot coin for sale in the auction but it's also one of the rarest. Coins of Constantine the Great as Caesar are quite rare.