This lot features a vintage 1966 Topps #183 3rd Series Checklist sports trading card. Released by Topps during a classic era of sports card production, this utility piece was designed to help mid-century collectors track their sets from cards 177 through 210. The front of the card features the distinct bold red and yellow "TOPPS BASEBALL CHECKLIST" header accompanied by a classic cartoon graphic of a baseball player throwing a ball in the upper right-hand corner. Notably, this specific card has been partially filled out with ink checkmarks by its original owner, offering a nostalgic glimpse into how vintage collections were curated. It serves as a unique addition for collectors interested in set variations, completion filler, or historical MLB ephemera.