The German post offices abroad were a network of post offices in foreign countries established by Germany to provide mail service where the local services were deemed unsafe or unreliable.
They were generally set up in cities with some sort of German commercial interest.
[2] Stamps from German post offices abroad are popular with collectors and some are quite valuable.
In a 2006 auction, a 40 Pfennig Germania hand-stamped "China" (Tientsin issue) stamp from 1900 realized 100,152 Euros.
German definitive stamps were used with overprints; after the first issue the value was changed to pesetas and centimos.