Most stamps in a series
China Post Group Co., Ltd.
China (Kaifeng)

The most stamps in a series is 1,606, entitled Chrysanthemums of the World, and was achieved by Kaifeng Branch of China Post Group Corporation (China) in Kaifeng, Henan, China, on 18 October 2016.

The stamps which form the Chrysanthemums of the World series were released from 2012 to 2016 during the annual Chrysanthemum Festival in Kaifeng City.