Lot
1889 
Sea Post Seal, 1895, black, Bremen, label seals left edge of 2¢ green entire bearing 2¢ lake (219D) and 1¢ Columbian (230) tied by "Menasha, Wis. Sep 26", New York (9.28) machine transit backstamp; label partial, otherwise Very Fine. Scott Nos. OXSP1 $1,750.
AN EXTREMELY RARE "NEW YORK - BREMEN" SEA POST OFFICIAL SEAL.
Sea Post Offices operated on board transoceanic steamers and processed mail posted on board or picked up at ports along the voyage. The need for official seals was very limited.