I collect mainly baseball, plus some non-sports sets.
Sets - N4, N20, N21, N31, N224, T6, T28, T51, T57, T96, T108, T200, 1962 Post
Players - Al Oliver, Bill Madlock, Claudell Washington, Dane Iorg, Don Mossi, Don Robinson, Don Zimmer, Edgar Martinez, Garth Iorg, Harold Baines, Jesse Orosco, Jim Rice, Joe Morgan, Johnny Grubb, Jorge Orta, Jose Cruz Sr., Ken Phelps, Larry White, Luis Salazar, Mike Greenwood, Mike Morgan, Oscar Gamble, Oscar Stanage, Otis Nixon, Sam McDowell, Shooty Babbitt, Sixto Lezcano, Terry Forster, U.L. Washington, Wade Boggs
Players with last name of Greenwood (baseball only)
HOF'ers - one contemporaneous plus one GU and auto for every HOF'er player / manager from 1901 - 2001
Players on the 1977 Mariners Roster
Type - 1800's to 1989 (baseball only)
Blank Backs and Wrong Backs - 1957 Topps - 1986 Topps baseball only (one of each)