(overprint on stamps of Syria): United Arab Republic (1958)
RUANDA
(overprint on stamps of Congo): German East Africa- Belgian occupation (1916)
RUE
(overprint on stamps of Ecuador): (control mark)
RUMANIEN
(overprint on stamps of Germany): Romania- German occupation (1918)
RUS.
(pre-adhesive handstamp): French {Russie} (1840)
RUSSISCH-POLEN
(overprint on stamps of Germany): Poland- German occupation (1915)
RWANDAISE
Rwanda
RYUKUS
Ryukus Islands (1950-72)
RZ.
(pre-adhesive handstamp): French {Hôpital Général de la Salpétrière} (Z was the index letter of the box at the Hospital; significance of R is unknown) (1783-1858)