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VERY FINE. A RARE BLACK JACK COVER TO BAVARIA WITH THE STAMPS TIED BY THE SUPPLEMENTARY MAIL TYPE A HANDSTAMP.
Supplementary Mail service provided for special handling of letters received after the mails for a scheduled steamer departure had closed. For a fee equivalent to the postage, a Supplementary Mail letter would be taken on board a ship at the docks just prior to sailing. It is rare used on a Black Jack cover. In this case the fee was either paid in cash, and the 28c in postage overpaid the 15c rate via Bremen-Hamburg Mail, or the double rate for Supplementary Mail was underpaid 2c.
Ex Allen (illustrated and described in Lane book on pp. 52-53) and Dr. Rorke (Image)
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