cover 1872 (Nov.), 1874 (June) and 1874 (Dec.) envelope from Colombo to Glasgow, each bearing 1872 48c. and illustrating the single, quadruple and treble rate frankings. An interesting trio

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cover 1872 (Nov.), 1874 (June) and 1874 (Dec.) envelope from Colombo to Glasgow, each bearing 1872 48c. and illustrating the single, quadruple and treble rate frankings. An interesting trio