Watch List notes:

Constantine I. AD 307/310-337. Æ Follis (27mm, 5.96 g, 7h). Treveri (Trier) mint. Struck AD 307-308. Laureate and cuirassed bust right / Mars advancing right, holding transverse spear and shield; S|A//PTR. RIC VI 776. Green-brown patina with some residual silvering, hard green hoard deposits. Good VF.

From the Dr. John Whitehead Collection. Reportedly found in Wendover, Buckinghamshire, UK, 1999.