The Hardball Times, one of my favorite baseball sites, occasionally posts a “Card Corner” entry, which serves to a) deconstruct the “meaning” of a particular baseball card; b) offer a mini-bio of the card’s subject(s); and c) comment on a particular event.
This one features Ken Holtzman’s 1972 card.
In those days, when the process of producing the cards was much more cumbersome (Topps was the only game in town at the time) air-brushing was quite common, especially later in the summer. The cards came out in batches, approximately 132 cards per “series” that were released on a monthly basis from February through August. A number of players might be traded during the course of the year, so Topps hauled out the old airbrush to bring the players hat and/or uniform up-to-date, often with mediocre results. Later on, they wised up, both aesthetically and financially, by putting out a “traded” set that featured the players in the actual togs of their new teams.