RE: m&m's with almonds
They definitely make Almond M&Ms now (I don't know about the 50s).
They're in a light beige package. I don't see them everywhere M&Ms are sold (not in vending machines or grocery checkouts), but very often at drug stores and convenience stores.
They're my favorite M&Ms. The almonds aren't great quality, but certainly a nice change from all those other peanut candies that America is so famous for.