Click on covers to see other examples:
By Flying Boat
27k
Zeppelin Mail
58k
Posted at Sea
43k
Paquebot
35k

 
Letter mailed at sea (Paquebot mail) from Seychelles to Switzerland
The term "Paquebot" was adopted by the Universal Postal Union in 1894. It is used to denote mail which has been posted on board a ship and taken ashore at the next port to be forwarded to its ultimate destination. A distinctive paquebot cancellation is used to cancel the letters as the covers usually bear the stamp of another country.

Seychelles Jubilee stamps: 6c, 12c, 20c, 1r.

This letter was mailed at sea en route from the Seychelles Islands (see map - A) and has a paquebot cancellation. It was subsequently mailed from the Bombay General Post Office (B) to Switzerland (C). This very rare item shows the correct postal rate.



map courtesy of  www.theodora.com/maps used with permission

Information and scan kindly provided by John Cooper