China, mixed lot with "the Postal service and telecommunications in China" from Claus Seelemann, "Postage Stamp Catalogue of the Peoples Republic of China 1949-1980", stamp catalogue People's Republic of China 1985 Richard Borek publishing house, Yangs Postage Stamp Catalogue 1993 as well People's Republic of China - Postal service place as well domestic postmark since middle the 50s from Klaus Heinzel