Not always... The Provincial mint Sovereigns SA, C, I, S, M, P etc. were usually minted in the provinces cos it saved shipping raw gold over on ships (where it could be looted), minting it into coins in England and then shipping it back over to the colonies on ships (where if they didn't get it the first time they could have a second attempt). Therefore the sovereigns were minted near to the gold source and then shipped wherever required which meant only one shipping rather than two.