Six pointed star on an ancient Roman Coin

 Six pointed star on an ancient Roman coin from Apulia, Luceria

225-217 B.C.E. Roman Coin

Teruncius, a very small brass coin 

Source: wikimedia entry

Luceria_Aes_Grave_Teruncius_85000747.jpg

British West African penny, 1936

The six pointed star represent the 6 British colonies of British West Africa:

Nigeria, Ghana, British Cameroon, Gambia, Sierra Leone, British Togoland. 

Source: CC image from Wikipedia entry: Britisch-Westafrika 

Six pointed stars on a Byzantine Coin

Anastasius I, 491 - 518 C.E.

Bronze follis (coin) minted in Constantinople, 512  C.E. The M marks 40 nummi

Along with a cross above the M