September and November 1899
|Spanish rule, Philippines o/p, no wmk, perf 14|
|2 centavos dark blue-green||1||1|
|other values 3c to 15c||2-6||2-6|
|German protectorate, German o/p, no wmk, perf 13½x14½ †|
|3 pfennigs dark brown||11||7|
|other values 5pf to 50pf||12-16||8-12|
† There are two versions of the German diagonal overprint with slopes of 48° and 56°. Scott  lists the 56° as Sc11-16 and the 48° as Sc11a-16a. Gibbons  reverses this with the 48° as SG1-6 and the 56° as SG7-12.
The Mariana islands, in the Western Pacific Ocean, were discovered by Magellan in 1521. Guam, to the south, was acquired by Spain in 1688. Following the Spanish-American War, 1898, the US took Guam. Handstamped Philippine stamps were then used in the remaining Spanish posessions. Germany purchased Mariana Islands as a proctectorate in 1899.
The islands were occupied by Japan in October 1914 and from December 1920 were a Japanese mandated territory. From July 1947 they have been a U.S. trust territory. In June 1975, the populace voted to be in the U.S. Commonwealth with internal autonomy. No local stamps were issued after 1920.