The Cantii Tribe occupied a similar area to that of modern day Kent, the name of which very probably deriving from ‘Cantii’. Julius Caesar considered the South-east corner of Britain to be the most civilised, if we look at the series of Potins which were in production at the time (few other tribes had started to produce coins at this early point) then it would suggest this to be true.
Other tribes must have quickly caught up and overtaken as the later series of coinage in Kent is rather minimal, Vosenos, Sam & Amminus only known by a handful of coins.