Detroit River Post Office Station

The Detroit River Post Office Station is the ONLY postal unit known in the world devoted exclusively to the delivery of mail to vessels that are UNDER WAY.

J.W. Westcott II is a boat that delivers mail to other vessels and also provides a pilot boat service to ferry pilots to and from other vessels. The boat operates out of Detroit, Michigan, and is the only floating post office in the world that delivers mail to ships as they are underway 

The Mail Boat is not owned by the USPS. It’s services are obtained by government contract with private owners.

Timor-Leste (East Timor)

Many thanks!!!!

Colombia

My first cover from Colombia, thanks Juris!!

Azores

Thanks Anabelle!!!!

Nearly all of the stamps issued for the Azores were stamps of Portugal, overprinted "AÇORES", of which the first appeared in 1868, continuing through 1930; after 1930, Portuguese stamps were used unmodified. The exceptions were the Vasco da Gama issue of 1898, the King Carlos issue of 1906, and the King Manuel issue and the Manuel revolutionary overprints of 1910.
On 2 January 1980, the use of separate stamps for the Azores (and Madeira) was revived. The modern stamps are inscribed both "PORTUGAL" and "AÇORES". The stamps have no special purpose beyond the expression of local pride; all are sold and valid in Portugal. About 5-10 are issued each year, generally with themes relating to the Azores.

Greenland

Thanks Jinesh!!

France

India

Malaysia

Thanks JP!!!

Thailand

Thanks JP!!!

Thailand

Thanks JP!

Brunei Darussalam

Grenada

thanks JP!!!

Portugal

China

India