1966 Tradewind 24′
Ohio | J O(I) 24 6 NNN
California | S O(I) 24 6 NNN,
(also O(I) 24 S 6 NNN late)
(5NN for Double-bed layout)
1966 saw the introduction of the Corning windows with Phillips openers, the only real way to tell a 1966/67/68 model from a 1965 model.