The Dekadrachm denomination
The dekadrachm - literally 10 drachms - was an ancient Attic Greek silver coin denomination weighing around 43 grammes.

I was valued at 10 drachms, which is equivalent to 2½ tetradrahms - or 60 obols.

They are amongst the largest, most beautiful, and priciest ancient coins on the market, and so are also often a target for counterfeiters.
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