Quote: I've heard the type ones were struck in 1975 and the type 2 were 1976 strikes. I don't remember now where I heard that though?
Correct. The Variety 1 CuNi Ikes were minted in 1975 and the Variety 2 were minted in 1976. The 1975 mint and proof sets have a Variety 1 Ike, the 1976 sets have Variety 2. All silver bicentennial Ikes are Variety 1.
I am sure there was some unintentional overlap, but I have never seen a set that had the incorrect Ike.