Coins from Eastern Celts
Gallic groups, originating from the various La Tène chiefdoms, began a southeastern movement into the Balkan peninsula from the 4th century BC. Although Celtic settlements were concentrated in the western half of the Carpathian Basin, there were notable incursions, and settlements, within the Balkan Peninsula itself.

From their new bases in northern Illyria and Pannonia, the Gallic invasions climaxed in the early 3rd century BC, with the invasion of Greece. The 279 BC invasion of Greece proper was preceded by a series of other military campaigns waged toward the southern Balkans and against the kingdom of Macedonia.

A part of the invasion crossed over to Anatolia and eventually settled in the area that came to be named after them, Galatia.
Eastern Celts
(1) Eastern Celts
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An AR Tetradrachm struck 120-10 BC in Thrace | Moesia
Obverse: head of young Dionysos right with ivy wreath

Reverse: nude Heracles left holding club, lion skin over shoulder; HPAKΛEOYΣ / ΣΩTHPOΣ, M / ΘAΣIΩN

Diameter: 0 mm
Die Orientation: 0 H
Weight: 16.14 g
Thasos imitative
Prokopov, Silberprägung group XII; cf. SNG Copenhagen 1046.
(2) Eastern Celts
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An AR Tetradrachm struck 2nd - 1st cent in Thrace | Moesia
Obverse: Stylized wreathed head of Dionysos right

Reverse: Stylized Herakles standing facing, head left, holding club, with lion skin draped over arm; H in inner right field

Diameter: 32 mm
Die Orientation: 12 H
Weight: 16.07 g
In imitation of Thasos off Thrace
Lanz 961-4; Göbl, OTA Class II; cf. HGC 6, 359 (for prototype)
(3) Eastern Celts
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An AR Tetradrachm struck c. 120-10 BC in Thrace | Moesia
Obverse: head of young Dionysos right with ivy wreath

Reverse: nude Heracles facing holding club, lion skin over shoulder illegible lugend (HPAKΛEOYΣ / ΣΩTHPOΣ / ΘAΣIΩN)

Diameter: -
Die Orientation: -
Weight: 16.3 g
No notes for this coin
Dembski 1524-1525; OTA Class IV.
(4) Eastern Celts | Alexander III
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An AR Didrachm struck 300-100 BC in an unknown location
Obverse: head of young Herakles right, wearing lion's skin

Reverse: Zeus seated left, leaning on scepter, holding eagle (goose)?; crescent left, AΛEΞANΔPOY (ΔIP) ?

Diameter: -
Die Orientation: -
Weight: 7.7 g
imitation of Carrhae?
Price B 40 (Var.) - Imitation Price 3816/3820?
(5) Eastern Celts | Demetrius I
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An AR Diobol struck 150-50? BC in an unknown location
Obverse: diademed head right

Reverse: cornucopiae IMBA?

Diameter: -
Die Orientation: -
Weight: 1.2 g
probably imitation of Demetrius I drachm
No references provided for this coin
(6) Eastern Celts | Philip III
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An AR Tetradrachm struck an unknown year in Thrace | Moesia
Obverse:

Reverse:

Diameter: -
Die Orientation: -
Weight: 15.26 g
Imitation of Philip III tetradrachm
Castelin 1347
(7) Eastern Celts | Philip III
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An AR unit struck an unknown year in Thrace | Moesia
Obverse: Philip II?

Reverse:

Diameter: 17 mm
Die Orientation: -
Weight: 1.9 g
No notes for this coin
No references provided for this coin
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An AR Drachm struck ~300-0 BC in Syrmia Region
Obverse: Head with point-eyes, ball-cheeks, neckbeard, and moon-shaped ear facing right, wearing a laurel-wreath.

Reverse: Horse to the left, circle above (mostly off flan)

Diameter: 19 mm
Die Orientation: 0 H
Weight: 1.4 g
No notes for this coin
Kostial 506
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An AR Tetradrachm struck an unknown year in Syrmia Region
Obverse:

Reverse:

Diameter: -
Die Orientation: -
Weight: -
No notes for this coin
No references provided for this coin
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An AR Drachm struck 300-100 BC in Syrmia Region
Obverse: laureate head of Zeus right (kugelwange)

Reverse: horserider left

Diameter: -
Die Orientation: -
Weight: -
No notes for this coin
???
(11) Serdi
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An AE unit struck 168-31 BC in Thrace
Obverse: Head of rivergod Strymon right

Reverse: Wide trident

Diameter: 22 mm
Die Orientation: 0 H
Weight: 8.37 g

Celtic imitation of Macedonian issue from 185-168 BC. Overstrike of Thessalonica, 187-31 BC, head of Dionysos with ivy wreath right, goat standing right, ΘEΣΣA_ΛO / N_IK_HΣ, (NE) / ? other monograms, Sear #1466; BMC Macedonia p. 110, 10 - 16. Head of goat and one ivy-leaf under Strymon's head are slightly visible. Imitations from Serdi region weren't used to fool Macedonian traders but as their own currency. This coin is one of overstrikes on official Macedonian coins which prooves this theory.

type: (A?)5B; imitation of: SNG Copenhagen 1298-9 var.
(12) Serdi
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An AE unit struck 168-31 BC in Thrace
Obverse: Head of rivergod Strymon right

Reverse: Wide trident; MAKE / ?ΔONΩN?

Diameter: 22 mm
Die Orientation: 0 H
Weight: 6.7 g

Celtic imitation of Macedonian issue from 185-168 BC. Overstrike of Thessalonica, 158-31 BC, head of Dionysos with ivy wreath right, goat standing right, ΘEΣΣA_ΛO / N_IK_HΣ, (NE) / ? other monograms, Sear #1466; BMC Macedonia p. 110, 10 - 16. Wave on Strymon's face is relic of original coin also there is slightly visible inscription (perpendicular to trident). Imitations from Serdi region weren't used to fool Macedonian traders but as their own currency. This coin is one of overstrikes on official Macedonian coins which prooves this theory.

type E3A, imitation of: SNG Copenhagen 1298-9 var.