The Siglos was a coin denomination in the Persian Achaemenid Empire, and was roughly equivalent to 7½ Attic obols. It was struck in silver.
In more understandable terms, it generally weighed 5.4 grammes, and was struck from circa 520 BC to 330 BC.
In more understandable terms, it generally weighed 5.4 grammes, and was struck from circa 520 BC to 330 BC.

(1)
Achaemenid Empire

Obverse: hero or king holding bow and dagger right
Reverse: incuse square; crescent countermark
Diameter:
15 mm
Die Orientation: -
Weight: 5.15 g
Die Orientation: -
Weight: 5.15 g
times of Artaxerxes I and Dareios II
Carradice type IV (early) A
(2)
Achaemenid Empire
Obverse: Great King right bearded and crowned kneeling-running, drawing bow, quiver at shoulder
Reverse: incuse square
Diameter:
14.5 mm
Die Orientation: -
Weight: 5.3 g
Die Orientation: -
Weight: 5.3 g
No notes for this coin
Carradice type II: Carradice plate XI, 11 - 13; BMC Arabia p. 173, 185 ff.; SGCV II 3428; Klein 754; Noe Sigloi pl. XIII, 215 ff.; Carradice NC 1998 pl. 3, 58 ff; Asyut Hoard 714; Winzer 1.6; Sunrise 21. Common. 73935
(3)
Croesus
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An
AR
Half-Stater
|
Siglos
struck 561-546 BC
in
Sardis
Obverse: Confronted foreparts of a lion and a bull
Reverse: Two incuse square punches
Diameter:
16 mm
Die Orientation: -
Weight: 5.41 g
Die Orientation: -
Weight: 5.41 g
No notes for this coin
SNG von Aulock 2877