Rare find. The Topps 1966-67 Test Set included 66 cards (2.5x3.5"). The Test cards are far rarer than the cards of the original set. Each of the cards has a "wood" border, a border lighter than that in the original set. Also, unlike the original set, the backs of this test set are written all in English, with no French used.  The six cards are: 55 Jim Nelson, 56 Bruce MacGregor, 57 Pat Stapleton, 58 Matt Ravlich, 59 Pierre Pilote, plus 66 Johnny Mackenzie, the last card in the set. NM-MT.