Count John McCormack drink glasses

"I have two drink glasses which I inherited in 1999. They were bought at auction by the previous owner (who lived in Dun Laoghaire) as being from the home of Count John McCormack. They are 17cm in height. They are very delicate and they have a very attractive stem. I do not know when they were made but they are very old and they have a great heritage of ownership! "