 These were the major stamp productions for everyday use . Commemorative stamps first appeared in 1929 , and these now appear several times a year , celebrating many aspects of Irish life , such as notable events and anniversaries , Irish life and culture , and many famous Irish people . Some definitive and commemorative stamps have been produced in miniature sheet , booklet and coil configurations in addition to the common sheet layout . Postage dues and airmails complete the stamp issues of the two , sequential , Irish stamp @-@ issuing authorities . Two styles of watermark were used though the overprinted issues came with the watermarks of the British stamps provided for overprinting by the British Post Office . 
