1975.
5$/hole. That's the cost from my first Scotland trip, and that included everything - food, air, car, lodging, golf, souvenirs. Self drive, father as roommate. Hotels were the Sun Court in Troon (which had real tennis), Mill Hotel in Perth (short walk to Famous Grouse distillery) Marine Hotel in N Berwick and Rusacks. Breakfast included.
Played 11 rounds in 8 days Turnberry (Ailsa), Troon, Prestwick, Gleneagles-King, Blairgowrie, N Berwick, Gulllane 1, Gullane 2, St Andrew (Old) Carnoustie, St Andrews (Old).
That's 198 holes, which means my cost was just under $1000
Maybe 4-5 pounds each round.