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You don't. If you've lost the gum due to an accident, you can use the stamp with a bit of glue on an envelope. If you are trying to make it back into a 'mint' stamp, as if it was just made, it is fraud and can even be considered a criminal act.

Re-using stamps, known as "washing" that have come off delivered mail is also a criminal act.

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15y ago

What else can I help you with?