The cards in this 660-card set measure 2 1/2" by 3 1/2". The 1973 Topps set marked the last year in which Topps marketed baseball cards in consecutive series. The last series (529-660) is more difficult to obtain. In some parts of the country, however, all five series were distributed together. Beginning in 1974, all Topps cards were printed at the same time, thus eliminating the "high number" factor. The set features team leader cards with small individual pictures of the coaching staff members and a larger picture of the manager. The "background" variations below with respect to these leader cards are subtle and are best understood after a side-by-side comparison of the two varieties. An "All-Time Leaders" series (471-478) appeared for the first time in this set. Kid Pictures appeared again for the second year in a row (341-346). Other topical subsets within the set included League Leaders (61-68), Playoffs cards (201-202), World Series cards (203-210), and Rookie Prospects (601-616). For the fourth and final time, cards were issued in ten-card dime packs which were issued 24 packs to a box, in addition, these cards were also released in 54-card rack packs which cost 39 cents upon release. The key Rookie Cards in this set are all in the Rookie Prospect series: Bob Boone, Dwight Evans, and Mike Schmidt.