I have several ancestors who served in the Royal Munster Fusiliers. As part of my research into the Royal Munster Fusiliers, I came across a deluxe edition of a History of The Royal Munster Fusiliers at a bookshop in Berkley Square, London. 114 copies were printed of the deluxe version. I have copy 103 and this was issued to a Lieutenant F.I.N McOstrich. His name is printed in the list of recipients at the start of the book. It appears to have been printed in 1927. I assume this is the same officer you mention in your post. The two books have detailed information about the regiment and its predecessors between 1652 and 1860.