Commemorating man's first landing on the moon, An Post have released a special series of four stamps featuring the astronauts aboard the Apollo 11 in which the Irish word for 'moon' is spelled incorrectly. 

The Irish word for moon 'gealach' is spelled 'gaelach' on two of four of the stamps released. 

An Post's stamp featuring Michael Collins in which moon in Irish is spelled incorrectly

RTÉ Raidió na Gaeltachta's journalist Marion Ní Shúilleabháin brought the error to the attention of An Post in a tweet to which they replied with an apology and stated that arrangements had been made to ensure an error of this type wouldn't happen again.

An Post's reply to Marion: