116 AD., Trajan, Rome mint struck for circulation in the East, countermarked at Raphaneia, Syria, by Legio III Gallica, As, RIC 644 var.

Trajan, Rome mint struck for circulation in the East of the Roman Empire, 116 AD., countermarked at Raphaneia, Syria, by Legio III Gallica,
As (ø 24-25 mm / 6,40 g), brass ("orichalcum"), axes about coin alignment ↑↓ (ca. 190°),
Obv.: [IMP CAES NER] TRAIANO OPT[IMO AVG GERM] , his radiate bust facing right, countermark behind, circular punch: bucranion, ø 7 mm (Howgego 294).
Rev.: DAC [PARTH]ICO [P M TR POT XX] COS VI PP / S C , around and in wreath.
RIC II, p. 290, no. 644 var. (countermark, type common) ; Coh. 122 var. (same) ; BMC 1090 var. (same) ; CBN 956 var. (same) ; McAlee 509 .
for countermark: Howgego p. 160, 294 (23 pieces listed) ; G.G. Brunk (ANSMN 1980) p. 74 f., type 18 .

This unusual issue struck at the end of 115 is typically attributed to an eastern mint, usually Antioch. The issue consisted of the as and semis, both with radiate busts, and both struck on orichalcum flans. Metallurgical tests have shown that the orichalcum used is indistinguishable from the orichalcum used for Roman sestertii and dupondii and quite different from the orichalcum used for some provincial issues. This fact, along with the style of the portraiture and legend, and the die axis of 6:00 versus the normal 12:00 die axis for the Antioch mint, suggests that this issue was minted at Rome and shipped to Syria. See the two articles by Metcalf in ANSMN 20 (1975) and 22 (1977), and Carradice and Cowell's article in Num. Chron. (1987).

Legio tertia Gallica ("Gallic Third Legion") was a legion of the Imperial Roman army founded around 49 BC by Gaius Julius Caesar for his civil war against the conservative Republicans led by Pompey. The legion's symbol was a bull. The cognomen Gallica suggests that recruits were originally from Gaul.
After the battle of Actium and Antony's suicide during Antony's civil war, the III Gallica was sent again to the East, where they garrisoned the province of Syria. After this, III Gallica was transferred to the province of Moesia on the Danube.
In the Year of the Four Emperors in 69, the legion, and the rest of the Danubian army, aligned first with Otho, then with Vespasian. They were instrumental in the final defeat of Vitellius in the second Battle of Bedriacum and in the accession of the Flavians to the throne of Rome.
After this civil war, the legion was again sent to Syria, where they fought against the Jewish rebellions of the 2nd century. They also took part in Lucius Verus' campaign (161–166) and in next Septimius Severus (197–198) campaign against the Parthian Empire, none with noteworthy success.
The legion was still active in Egypt in the early 4th century.
more on https://en.wikipedia.org/wiki/Legio_III_Gallica