This is an ad from the New Yorker magazine, December 1965. I think the take-out message is, the more things change, the more they stay the same. Only the prices are different.
(Actually, that is not entirely true. There are now, inevitably, Lego that look suspiciously like guns.)
(Also: is the plural of Lego "Lego"?)
(Also: you can right-click etc on the picture for a closer look.)