The Tetartemorion denomination
A tetartemorion is an ancient Greek denomination worth 1/4 obols, and weighing 0.18 grammes.

The name comes from 'tetarton', meaning a fourth, and 'morion' meaning part - a "quarter-part".
Tetartemorion
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An AR Tetartemorion struck 420-390 BC in Mylasa?
Obverse: forepart of lion right

Reverse: pigeon left, pellet above and below

Diameter: -
Die Orientation: -
Weight: 0.2 g
No notes for this coin
SNG Kayhan 947
(2) Himera
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An AR Tetartemorion struck Before 484 BC in Himera
Obverse: Cock striding left

Reverse: Incuse square with mill-sail pattern

Diameter: -
Die Orientation: -
Weight: 0.21 g
No notes for this coin
Kraay-307 (illustrated by a broken example in Palermo), cf. SNG ANS-145
(3) Kolophon
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An AR Tetartemorion struck 520-500 BC in Kolophon
Obverse: head of Apollo right

Reverse: incuse square

Diameter: 5.5 mm
Die Orientation: -
Weight: 0.17 g
No notes for this coin
SNG von Aulock 1810 var(head right); SNG Kayhan 352
(4) Kyme
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An AR Hemiobol | Tetartemorion struck 480-450 BC in Kyme
Obverse: head of eagle left; KY

Reverse: quadripartite incuse square

Diameter: -
Die Orientation: -
Weight: 0.3 g
No notes for this coin
SNG Cop 31; Klein 333. (hemiobol)
(5) Phokaia | Teos
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An AR Tetartemorion struck 521-478 BC in Phokaia | Teos
Obverse: head of griffin left

Reverse: incuse square

Diameter: 5 mm
Die Orientation: -
Weight: 0.28 g
No notes for this coin
Cf. Hirsch 221, lot 331, BMC 88-89
(6) Teos
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An AR Tetartemorion struck 475-450 BC in Teos
Obverse: seated griffin right, rising leg

Reverse: quadrate incuse square

Diameter: -
Die Orientation: -
Weight: 0.29 g
No notes for this coin
SNG Kayhan 601