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UNITED STATES, Native proto-currency. Northern Pacific coast. 18th-early19th century
Shell “kop-kop” (29mm by 6mm, 0.38 g)
Tubular shell of the dentalium genus of mollusks
Robert Stearns, Ethno-conchology: A Study of Primitive Money p. 314-321
Ex Detroit Museum of Art
Kop-kops were smaller or damaged pieces of hi-qua shells and circulated as a fraction of the hi-qua. Use of this shell type as currency ranged from northern California to Alaska.
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