Here is an ancient tin alloy  Pegu coin of  Mons people in Dvaravati period. Mons had migrated  from southern Myanmar into the central region of Thailand (Dvaravati Kingdom at that time) and had brought the coins with them. 

Thus found this type of Pegu coin  in the Dvaravati region . 

Obverse :  Depiction of big conch and  Pallava script above

Reverse :  Depiction of sun and moon  and fish below, Pallava script in center

Material :  Tin alloy

Condition : good

Date :  5 - 6th century

Size :  60 mm. in diameter. (Big size. very rare!!!)

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