Here is my best version of the coin of Licinius, just for show-and-tell... Licinius I AE Follis, 21mm, 3.18g Siscia mint: 315-316. Obv.:IMP LIC LICINIVS P F AVG; Laureate head right. Reverse.: IOVI CON-SERVATORI; Jupiter standing facing, head left, nude but for chlamys across left shoulder, Victory on globe in right hand, scepter in left, eagle with wreath at feet to left; Γ in right field; • SIS • in exergue Reference: RIC VII, 17. Ex Harlan Berk, CICF Show, April 2013.
Is there any story why eagle also bring him wreath? And what is meaning of Δ on coin's.It's workshop codes delta or number four mint mark. But what is actually mean that?
Each mint had various workshops. Smaller ones had one or two, larger ones quite a few more. Delta stands for the fourth workshop, or officina, as they were called by the Romans. For whatever reasons, it was important for the Romans to keep track of exactly where their coins were made during this period, a tradition that has carried over to modern times.
It was means whereby the Romans were able to keep track of quality control and quantity minted. As JA said, this has carried over to modern minting. Take a look at U.S. coins minted in Philadelphia, with the "P" mintmark.
And where was the fourth workshop? And how about quality? Is there some diferent betwen workshop quality? where make beter quality? Here is link where is 600 cities but dont show which is one two..four... http://tjbuggey.ancients.info/orter.htm
The workshops were at the mint, meaning, the mint was comprised of workshops. In your case, the fourth workshop of the mint of Siscia.