Paquebot; packet boat, mail boat?

No, in this case, what is meant is a stamp used on mail items posted on board ships. Sailors who wanted to send letters or postcards could frank their mail with stamps from their 'own' country. A homegrown example. A marine engineer on board the SS Capulonix, a tanker of Shell Tankers NV in Rotterdam, wanted to send a letter to a contact in Suriname.   He was at sea, and after the letter was ready, two Dutch stamps totaling 60 cents were affixed to the envelope. Upon arrival in the port of Hamburg, an impression of the PAQUEBOT stamp was applied. This stamp is supposed to be printed on the envelope, but a postage stamp was also used to stamp it. The letter went to the airport of Hamburg and there the stamps were cancelled with the German stamp HAMBURG FLUGHAFEN on November 2, 1971. From there, the letter was sent by airmail to Suriname.   But could all this just happen like that? The German post did all the work and got paid nothing! According to a regulation of the Universal Postal Union, the UPU, that was possible. There was no post office on the ship itself, so the affixed stamps had to be postmarked at the post office in the country of postage. The PAQUEBOT stamp had to be applied to prove that the letter was correctly franked and should not be charged postage. Yet another nice piece of mail for the collection! Sea mail, airmail, fun mail. One more thing about the tanker. The steamship Capulonix It was built in 1959 at Bethlehem Steel Corp in Quincy, USA, and had a displacement of over 50.000 tons. The tanker sailed under the Liberian flag and was taken out of service in 1979 after a serious collision and scrapped in Taiwan.