These coins have a similar style to the early issues of Lugdunum but are unmarked. At some point these coins have been assigned to either London or Rome. RIC assigned them to Lugdunum. Bastien separated these out from the Lugdunum issue and allocated them to an Uncertain continental mint thought to be operating around the time of the British invasion. More recently this has been proposed as being possibly at Boulogne. For some reason Victor's interesting post is now missing from the thread. When he posted that I was aware that I had the following coin en-route. Diocletian AE Follis Obv:- IMP C DIOCLETIANUS P F AVG, Laureate, bust right Rev:- GENIO POPV-LI ROMANI, Genius standing left, modius on head, naked but for chlamys over left shoulder, left hand holding cornucopiae and right hand holding patera Minted in Lugdunum (None). c. A.D. 296 Reference:- RIC VI Lugdunum 14a. Bastien XI Annex AN6 Uncertain continental mint (Boulogne?) operating around the time of the British invasion I haven't seen too many with this level of detail and silvering.
Here is one of mine with exceptional silvering, Ric 41. 22mm, 4.87g Diocletian AE Antoninianus. Lugdunum, AD 285. IMP CC VAL DIOCLETIANVS PF AVG, radiate draped bust right / IOVI CONSERVAT AVG, Jupiter standing left, holding thunderbolt and sceptre, B to left. Cohen 215.
DIOCLETIAN AE27 Silvered Follis OBVERSE: IMP C C VAL DIOCLETIANVS P F AVG, laureate head right REVERSE: GENIO POPV-L-IROMANI, Genius standing left, holding patera & cornucopia, HTA in ex. Struck at Heraclea, 296-297 AD 9.3g, 27mm RIC VI 19a