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加拿大荣盛康问 实寄封作为一种邮史品现已越来越受到集邮者,尤其是组集者的重视,请问在不同类别的集邮展品中应怎样选择实寄封,以及怎样利用实寄封上的各种信息?
As a kind of postal product, Canada Shengshengkang has received more and more attention from stamp collectors, especially the collectors. How to select the correct type of stamps in different types of philatelic exhibits and how to use them information?