"Arabian coins were also the common currency in Scandinavia for 1000 years."
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This is fantasy by whoever writes the article. There may have been coins originating in Arab dominated areas for some hundreds of years but "common currency" ofr "1000 years"!!! Outlandinsh claim.
Yes, I quite agree. All people used whatever coin was around, provided it was made of some kind of valuable metal (silver, gold) or an alloy thereof. Often these would be shaved to make them weigh the same as whatever the local standard was.