The first card in the series goes to the 1976 SSPC George Brett #167.
This set, originally printed in 1975, challenged the Topps monopoly in the card market. Based on the 1953 Bowman design, this set is sometimes referred to as the "Pure Card" as the fronts are strictly player photos. The set maker was eventually sued by Topps and further production of these sets was prohibited. (http://www.baseballcardpedia.com/)