I had to have this coin because of the Constantiniana Dafne reverse. Much has written about this reverse type and I will not rehash it all here. However, I do want to mention a couple of things. First, there is some disagreement as to the meaning of the reverse inscription. Some have said it refers to a fort named Dafne, others have pointed out that this fort was already destroyed when this coin was minted. Since this coin was minted after Constantine's defeat of Licinius, it is possible this coin refers to that victory. The next interesting item is the figure of victory on the reverse. Victory changed from a pagan representation into the christian angel. I would argue that at this time in history both pagans and Christians would recognize the importance of this figure.
Another interesting aspect of this coin in particular is the provenance. It was part of a famous collection, the Dattari collection. Dattari is known for assembling a complete collection of Egyptian tetradrachms of Alexandria. He also collected other coins, including this one.
On top of all that, it is just a very lovely coin.
Constantine I. Follis. Constantinople (328-9)
(19.6 mm 2.60 g)
Obv: CONSTANTINVS MAX AVG, rosette-diademed, draped bust right
Rev: CONSTANTINIANA DAFNE, Victory seated left on cippus, looking right, holding palm branch in each hand, trophy in background, captive seated left at foot.
Officina letter B in left field. Mintmark CONS star.