 The Irish Post Office has never publicised an official stamp numbering system for the postage stamps they issued , so collectors use a stamp numbering system from one of the most popular stamp catalogues , such as Stanley Gibbons , Scott , MacDonnell Whyte , MDW ( last edition 1991 ) , Hibernian or Michel . There are differences between these numbering systems that result in a varying sequence of stamps in each listing , with some stamps included on some lists but not on others — usually varieties that the publishers think do not belong in a general catalogue . For instance , Ireland 's first postage stamp , the 2d Map of Ireland , issued in 1922 is numbered 68 by Scott , 43 by Michel , D4 by Hibernian and MacDonnell Whyte and 74 by Stanley Gibbons . 
