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Travancore (India) 1 Cash ND (1901-1910)
Lovely little copper, @Hondo Boguss!

And those are beautiful ancient Greeks, @arkadyn!

On the question on how the ancient Greeks carried around their coins - large or small - I would think they were mostly carried in pouches or purses. The pouch could be worn on a belt, since ancient Greek clothing did not have pockets. Pouches, though, have been used since (at least) the Bronze Age.
And why did they bother with such tiny coins? A tetartemorion was 1/4 of an obol, or 1/24 of a drachma - a very small amount of money. It was enough for a piece of bread, some salt, or maybe enough lamp oil for one evening, but mostly it was used as smallchange. Given as change at the market - "Sale! Only 23/24 drachma for a jug of Kos wine!" - or used when splitting the bill at the tavern. So there was a need - just like for the US 1 cent coin . . .
Sizewise, the tinyness was a consequence of the silver standard used for coinage. An Attic drachma should weigh 4.3 grams, and a tetartemorion consequently 1/24th thereof, or 0.18 grams. Only later, around the 4th century BC, did copper become accepted as a metal for coinage, and then small denominations could be realized as larger coins.
Here is a rather insignificant Medieval coin from the bishopric of Le Puy, France. It dates from around 1100, weighs 0.23 g and measures 13 mm. It was valued at 1/4 denier, the smallest denomination minted in France at the time. Like the tetartemorion, used for the tiniest of purchases and as smallchange (and for alms giving).
