CIMRM 827 - Denarius recut with inscription. St. Albans, Britain
See also this photo by Carole Raddato, 2014.
From: Verulamium museum:
See Roger Beck, "Mithraism since Franz Cumont", ANRW 2, p.2049:
For "Phrē", see H. D. Betz, The Greek magical papyri in translation, vol. 1., p.338:
I.e. MITHRAS OROMASDES and PHREN.
See also Spocking Fives and a Mithraic token. Currency defacement ancient and modern, 4 Mar 2015, which adds: