Early 1960, this mold had a round Breyer Stamp (missing the C) on the belly, along with a partial 'Hess' engraved on the inside right leg. Late 1960-1961, the stamp moved to the right hind leg and early versions had a backward C. Around 1961-1962, Hess was removed and the C was now facing down.
In 1960-1961, this mold had rounded, inward curving ears; 1962-1969 the ears were more pointy with the right ear being very wide.
In 1961-63, released through Montgomery Ward, and in 1962-1963, released through Sears.