A Tradewind, perhaps. Why pre 70? '69 looks almost exactly like a '70 except for some details like the extra square corner in the wing windows... if you're looking for the previous shape, you want '68 or earlier. The pre-'69 Overlanders were 26', too big for your requirement, but the Tradewinds were 24' then.
Il Carriaggio — 1975 Argosy 24 | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill