Identification of authenticity of postage stamps
R24/P24/普24, Grotto Art in China《中国石窟艺术普通邮票》 Stamp Title: Grotto Art in China Scott No: 2189-92 Serial number: R24 Values in set: 4 (4-1), Yungang Grottoes, Big Buddha(North Wei), 200 fen, 30*40 mm (4-2), Longmen Grottoes, Hercules(Tang Dynasty), 500 fen, 30*40 mm (4-3), Maijishan Grottoes, Bodhisattva(West Wei), 1000 fen, 30*40 mm (4-4), Dazu Carved Stone, [...]
R22/PU22/普22, Regular Issue with Designs of China Scenery《祖国风光普通邮票（影写版）》 Stamp Title: Regular Issue with Designs of China Scenery Serial number: R22 Values in set: 5 (5-1), Huangguoshu Waterfall, 3 fen, 36*31 mm (5-2), Hainan, 4 fen, 26*31 mm (5-3), the Great Wall, 8 fen, 26*31 mm (5-4), Forests of Northeast, 10 fen, 26*31 mm (5-5), [...]
R18/PU18/普18, Regular Issue with Designs of Industrial and Agricultural Production and Construction《工农业生产建设图案普通邮票》 Stamp Title: Regular Issue with Designs of Industrial and Agricultural Production and Construction Serial number: R18 Values in set: 14 (14-1), Coal mine, 1 fen, 22*27 mm (14-2), Animal husbandry, 1.5 fen, 22*27 mm (14-3), Port, 2 fen, 22*27 mm (14-4), [...]
C092/JI92/纪92, Scientists of Ancient China (2nd Set)《中国古代科学家（第二组）》 Stamp Title: Scientists of Ancient China (2nd Set) Scott No: 639-646 Serial number: C92 Values in set: 8 (8-1), Cai Lun, 4 fen, 26.5*36 mm (8-2), Paper making, 4 fen, 26.5*36 mm (8-3), Sun Simiao, 8 fen, 26.5*36 mm (8-4), Chinese traditional medicine, 8 fen, 26.5*36 [...]
R12/PU12/普12, Regular Issue with Designs of Revolutionary Monuments (2nd Print)《普12 革命圣地图案普通邮票（第二版）》 Stamp Title: Regular Issue with Designs of Revolutionary Monuments (2nd Print) Serial number: R12 Values in set: 14 (14-1), The 81 Building in Nanchang, 1 fen, 21*17 mm (14-2), The 81 Building in Nanchang, 2 fen, 21*17 mm (14-3), Sha Zhou Ba [...]