Massive Roman gold piece

Massive Roman gold coin - multipla worth 18 solidus, ceremonial medallion minted in Constantinople by Emperor Valentinian I in 4th century AD (between year 364 and 375 AD), found in Zatonje village, between Roman fortresses Lederata and Pincum, vicinity of Veliko Gradište, on the Danube river in eastern Serbia.
The coin is unique, since no similar piece has ever been found anywhere on the territory of the former Roman empire.
On the obverse side is depicted portrait of the emperor Valentinian I dressed in cloak attached with luxurious brooch on his right shoulder. He is wearing a diadem on the head, as a symbol of Imperial power.
Reverse side depicts the emperor defeating barbarian enemies – he is holding one of them by the hair while in front of the emperor there is a kneeling female with Phrygian hat. Emperor is holding a banner or signum, weapons of defeated enemies are laying beneath his feet and goddess Nike is above him.
The medallion weighs 80.45 grams and it's the heaviest Roman gold coin ever found in Serbia.
Collection of National Museum of Serbia in Belgrade. 

The discovery of this massive Roman gold coin, a unique ceremonial medallion from Emperor Valentinian I's era, is a remarkable historical find. Its intricate depictions and historical significance, including its weight as the heaviest Roman gold coin in Serbia, make it a valuable addition to the National Museum of Serbia's collection, preserving the past for future generations to admire and learn from.

That is definitely one of the most interesting Roman coins. 

Its a medal, The value of 18 solidus added here to it as i see it is just calculated from the gold weight.

Fantastic and wonderful find.