Worldwide 20g stamp sold for £1.28p
Type III Code at bottom both numerals and letters smaller service indicator.
Date code MA12
BP Overprint "The B.P.M.A"
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Type I Code at bottom all numerals and large service indicator.
Type II Code at bottom all numerals and smaller service indicator.
Type IIa Code at bottom all numerals and smaller service indicator ranged to the left.
Type III Code at bottom both numerals and letters smaller service indicator.
