Roman coin I.D. help - SOLVED

[diggerfororo]

I found this coin a couple of years ago and just got around to cleaning it up. I identified the ruler but on the reverse, at the bottom where the mint mark is, it reads XXIBI. Can anyone tell me what this means?

"May there always be a road"

Les

 

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[mercenary]

Re: Roman coin I.D. help

Diocletian AE Antoninianus. 289-290 AD. 3.8 gm. 23 mm.
Obverse: IMP C C VAL DIOCLETIANVS PF AVG, radiate cuirassed bust right. Reverse: CONSERVATOR AVGG, Jupiter standing left, holding scepter & Diocletian opposite, holding scepter, each holding patera & sacrificing at altar between them, XXIBI in exergue. Cohen 44.

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[Mackaydon]

Re: Roman coin I.D. help

In the exergue you have the letters XXI (dot) BI.
The XXI stands for the ratio of copper to silver: 20:1 (Source 1)

The "BI" is an abbreviation for Jupiter. (Source 2)

Don.....

Sources1) 'Step 6' here: http://ancientcoinsforeducation.org/content/view/75/81/
(2) http://dougsmith.ancients.info/feac73xxi.html