Cos, silver, drachms (Heracles/crab & club) (180-170 BCE)

180 BCE - 170 BCE Silver 2,078 kg

Obverse:	Head of Heracles right, wearing Nemean lion skin headdress.
Reverse:	ΚΩΙΟΝ (Greek).Crab. Beneath, club. In the field, magistrate name and letter(s). All within incuse square.

Caria (islands)

180 BCE

170 BCE

Period: Hellenistic ^{323-30 BC}

Silver

3.10

drachma

Die study reference:	"[[Die study reference" contains a listed "[" character as part of the property label and has therefore been classified as invalid.]]1Ingvaldsen 2002, p. 363-365 (series XXIII)
Coin series reference:
Coin series web reference:	https://greekcoinage.org/iris/id/cos stefanaki 2012 13.40 http://hno.huma-num.fr/browse?idType=1443 http://hno.huma-num.fr/browse?idType=1442

no distribution is available

Number of obverses ^ᵖ (o)	16	Number of singletons (o1) ^ᵖ	13
Number of reverse dies (r)	17	Number of coins (n)	26
Coins per obverse die (n/o)	1.63	Coins per reverse die (n/r)	1.53
Reverse per obverse ratio (r/o)	1.06	Percentage of singletons (o1) ^ᵖ	81.25 %
Original number of dies (O) (Carter 1983 formula) ^ᵖ	33.52	Coins struck if 20,000 as average productivity per die ^ᵖ	670,400
Original number of dies (O) (Esty 2011 formula) ^ᵖ (O)	41.6	Survival rate if 20,000 as average productivity per die ^ᵖ	0.00004
Coverage (o = % of O) (Esty 1984 formula) ^ᵖ (o = % of O)	50%	Die productivity if survival rate 1/2,000 ^ᵖ	1,551.31
Weight of silver (in kg) if 20,000 coins per die (O = Carter formula) ^ᵖ	2,078 kg <br /> 2,078 kg	Die productivity if survival rate 1/5,000 ^ᵖ	3,878.28

References

^ Ingvaldsen, Håkon (2002), Cos. Coinage and Society. The chronology and function of a city-state coinage in the Classical and Hellenistic period, c. 390 - c. 170 BC, unpublished doctoral dissertation, Oslo University.