This is a 1991 Post Cereal Collector Series baseball card featuring Gregg Jefferies of the New York Mets. The card is identifiable by its distinctive yellow border and the Post logo in the upper left corner. As a grocery-promotional set, these cards were often found on the back of cereal boxes, meaning they were cut by the consumer. The card shows Jefferies in his Mets batting stance and serves as a classic piece of early 1990s food-issue baseball card memorabilia.