Watch List notes:

Diocletian BI Radiate. Ticinum, AD 290. IMP C C VAL DIOCLETIANVS AVG, radiate and draped bust right; countermark: long cross-like feature between two pellets / IOVI CONSERVAT, Jupiter standing left holding thunderbolt and sceptre, eagle before him, two vexilla behind, [S]XXIT in exergue. RIC 226; Cohen 205. 2.67g, 23mm, 11h.

Good Fine. Extremely Rare; a highly unusual (medieval?) countermark.

From the inventory of a UK dealer.