Diocletian AE Follis. 305-306 AD.

D N DIOCLETIANO FELICISSIMO SEN AVG, laureate bust right, wearing trabea, holding branch and mappa
PROVIDENTIA DEORVM QVIES AVGG, Providentia standing right, extending right hand to Quies, standing left, holding branch and leaning on sceptre, S-F across fields, KS in lower centre, PTR in ex. 

RIC VI Trier 677a. Rare.
Note: This coin was actually struck in Cyzicus. The PTR was
left over from the original dies sent to Cyzicus by the 
engravers in Trier. The mintmark is actually the KS in the 
lower centre.

With permission of Roma Numismatics, June 2009