Correct, Drogheda FC formed in 1962, and joined the League for the 1963/64 season (along with a returning Sligo Rovers as the league expanded to 12 teams again having reduced to 10 the previous season. Good job messing like that is a thing of the past...)
They amalgamated with the older, non-league, Drogheda United ahead of the 1975/76 season.
Just looking back through some random old newspaper reports, it was definitely Drogheda FC that beat us in October 1970 for the first time in four years, and again in January 1973 it was Drogheda FC we beat on the way to that last title.
Any mention of Drogheda United pre-1975, in newspapers or programmes, most likely is just confusion between the two names, or (in the papers) actually refers to the non-league outfit. They were active in the AUL which would have been covered quite a bit in papers like the Herald, at least.
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