Here's a bit of interesting history concerning your post card:
"Almost from its inception postcard publication was caught up in the politically reality of British rule in Ireland. As a result of an international agreement concerning the delivery of mail between countries, the Post Office printed its first foreign destination postcard on 1 April 1879. This was a buff coloured, embossed postcard, longer than the official inland card, with the Words - 'Union Postale Universale' printed top centre. Below this was printed 'Great Britain', then 'Grande Bretagne', and below this the words 'Post Card'. Irate Irish Unionists immediately informed the Postmaster General that there was no such political entity as 'Great Britain'; forcing him to reprint the cards with the legend - 'Great Britain and Ireland'."
The whole article can be found in this link:
http://www.askaboutireland.ie/readi...-postcard-1/