The combination of fifteen cents registry fee, three cents return receipt requested fee, and three cents postage equals twenty-one cents. These rates coincided from July 6, 1932 to March 26, 1944.

This cover was sent registered, return receipt requested, in January of 1940.

This cover was sent to Canada, registered, return receipt requested, in July of 1942. The postage and the registry fee were the same as for a domestic letter, but the return receipt should have been charged five cents, not three, leaving it two cents underpaid.

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