I would better correct myself

.
After some browsing, i realize the name in the blade is READ and certainly that of the sword maker. I have read that they used the Irish harp in their decoration.
There were more than one Read making swords in the same period in Dublin.
A certain "Family Read" is mentioned, with shop in Parliament street but, apart from Thomas, other family members are not so easily spotted.
There was also another Read in Dublin, with premises in College Green, who was considered one of the best. His name was John and, unless he used the Latin style, which i doubt, is no match for the initial I.
Probably Cathey has (Irish) sword makers directories ?