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A note on British first day postmarks: Along with the Bureau and other official FDPs, there are ofen a number of commemorative postmarks associated with a stamp issue. In addition to cancelling FDCs these additional postmarks can also be used to cancel mail franked with other stamps than those from the the issue the postmark is commemorating. Due to the obvious connection to the stamp issue we have decided to list them as FDPs rather than commemorative postmarks.