One of unique postal history were the shipmail postmark when letters posted on the High Seas on the ship departured from Singapore and destination at Indonesia port. Many collectors asked me why Straits stamps from Perak and Johor were cancelled Singapore , Straits stamps were canclled Indonesia (DEI) port or city cancelled (used abroad) and why the letter from Singapore cancelled with KPM (Dutch East indie Royal Ship) beside Paquebot stright line and Paquebot Singapore ?
Rules for letters posted on the HighSeas were drown up at the Postal union Conference in 1891. The used of the world “PAQUEBOT” was officially adopted at the UPU Congress,Whasington.USA in 1897 for international use on correspondence posted on the HighSeas and handed over to the Postal administratiob at the first port of call.
Brief the rules are : letters posted on the Highseas bearing the stamps of the country in which the ship registered will accepted at the first port of call in any country for onward transmisssion to another member country of the UPU without further charge.The stamp(s) should be cancelled with the cancellor of the port and the indicator mark “Paquebot” applied alongside. The letters posted on the HIghSeas are to be handed over to the postal authorities immediately on arrival, they should not be posted in a shoreside letter box.
Many variation were found, Singapore have 2 type straight line Paquebot Mark type 1 and 2, beside that 3 type paquebot combined Port’s name “Paquebot-Singapore” postmark type S3,4, and 5.
Pre war Singapore paquebot postmark S4 and S5 very shortly used after the reoccupation (rare0, and some of destination postmark (Indonesia port) on Singapore departure ship without Paquebot Postmark (Used abroad).
I hope after look carefully at the illustration from shipmail 1 ( with Singapore Paquebot or KPM-Dutch east Indie (Indonesia) royal ship postmark, and Shipmail 2 : Indonesia (DEI) port only postmark without paquebot mark , all the collector will understand and have the answer why other country stamps used in other country (Used abroad) with or without paquebot postmark. This collaction were the Marine ship collection thema, became populr among the Marine persons as the memorable of te ship where he/she or their family ever work or travel and write the letters on the high seas. Now everybody travel via Aeroplane and Paquebot mark never seen anymore. The last Paquebot letters circa 1970, a ship enroute from Singapore to Indonesia , like Medan (belawan),Jakarta (TandjongPriok) should used her country’s stamps at the Port belawan or tandjong priok but Indonesia Stamps at Medan or Jakarta.