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Sri Lanka has had trade with Arabs for over two Millenniums and therefore the coin can be from any era.
I have displayed the crescent pointing upwards as the new moon is seen from latitudes close to the equator. Crescent Moon is seen tilted sidways at higher geographical latitude as shown on flags of Pakistan and Turkey.
Cresent and Star of Pakistan Flag. | Cresent and star of Turkey Flag. |
It is impossible to see a star within the cresent moon, as it would be occulted. To give any reality to the dipiction, it needs to be an impact on surface of the moon or a meteorite that happend in line-of-sight to the Moon. See event of 1178, June 18th observed by five Monks Canterbury and reported in the abbey Chronicle.
The coin was scanned at 600 dpi and displayed at 600 dpi. It was purchased in 2008 July from a dealer in Galle.