philately
study of stamps and postal history and other related items
Aerophilately
airmail-related stamp study
topical stamp collecting
the collecting of postage stamps relating to a particular subject or concept
St. Andrew's cross
saltire cross, crossed X design, sometimes on sheets of stamps
Korea Stamp Museum
postal museum in Pyongyang, North Korea
First day (of validity)
first day on which a stamp is valid or a special postmark is used
postal history
the study of postal systems and how they operate and, or, the study of the use of postage stamps and covers and associated postal artifacts illustrating historical episodes in the development of postal systems
Antarctica on stamps
Wikipedia article page
philatelic collection
type of collection containing items related to the study of philately