Convert from gamma to obolos [Ancient Greece]

Unit Definition (gamma)
The gamma is an informal metric unit of mass equal to 1 microgram (µg).

Unit Definition (obolos [Ancient Greece])
The obolos [Ancient Greece] is a historic unit of weight or mass. The obol is a very small weight that originated as the weight of a tiny Greek coin. In ancient Greece the obolos was equal to 1/6 drachma, or roughly half a gram (8 grains).