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What do the mintmarks on pre-decimal Australian coins stand for?

Answer:
Mint marks are -
I = India (Calcutta or Bombay)
PL = Royal Mint London
K.G = Perth Mint (the dot only) KG is the designers initials
M = Melbourne
D = Denver
S = San Francisco
H = Ralph Heaton, Birmingham
. = Perth Mint

Most predecimal coins without a Mint Mark, were minted at the Melbourne Mint.
First answer by Phil Lewis. Last edit by Phil Lewis. Contributor trust: 787 [recommend contributor recommended]. Question popularity: 1 [recommend question].