collaborated a number of times with the postal administration of other countries to release a joint issue. [top] Monaco [top] Mongolia Mongol Post, the national postal service of Mongolia, has collaborated with some postal administration of other countries to release a joint issue. [top] Nepal [top] Netherlands [top] Norway Posten Norge has collaborated a number of times with other postal administration to release joint issues. [top] Pakistan Pakistan Post has collaborated with other countries to release several joint issues. [top] Peru Serpost, the national postal service of Peru, has collaborated with some postal administration of other countries to release a joint issue. [top] Philippines Philippine Postal Corporation, the national postal service of the Philippines, has collaborated with some postal administration of other countries to release a joint issue. [top] Poland [top] Portugal [top] Romania [top] Russia Russian Post has collaborated a number of times with other postal administration to release a joint issue. [top] Slovakia [top] Slovenia Pošta Slovenije has collaborated a number of times with other postal administration to release a joint issue. [top] South Africa South African Post Office has collaborated with some postal administration of other countries to release a joint issue. [top] South Korea Korea Post has collaborated a number of times with the postal administration of other countries to release a joint issue, mainly commemorating diplomatic relations. [top] Spain [top] Sweden Posten AB has collaborated a number of times with other postal administration to release a joint issue. [top] Thailand Thailand Post has collaborated a number of times with other postal administration to release a joint issue. [top] Turkey [top] United Nations [top] United States The United States Postal Service collaborates with the postal administration of another country to release a joint issue on a sporadic basis. With seven joint issues, Sweden is the most prolific philatelic partner of the United States. [top] Uruguay [top] Vatican City [top] slo See also Omnibus issue References External links Joint issues at Australian Post Office Joint Stamp Issues Society - JSIS Philatelic terminology