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On His Majesty's Service or On Her Majesty's Service (depending on the gender of the reigning monarch) was an official franking formerly seen on correspondence from government departments in the United Kingdom, Canada, Australia and other countries that share the same monarch as their head of state (now known as Commonwealth realms).
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The expanded form, On His/Her Britannic Majesty's Service has been used for international correspondence, for example for mail to British diplomatic posts in other countries.
In Australia before Federation, letters in envelopes franked with the O.H.M.S. mark were exempt from postal fees. [1]