The 1990 Fleer Update set was issued in the fall of 1990 and showcased players who had been traded during (or shortly before) the season, and rookies who had made some sort of impact during the season but didn’t already have a solo card in the base 1990 Fleer set.
As in years past, the entire 132-card update issue was available only as a complete box set, usually from hobby dealers. Although the 1990 Fleer Update set was produced in large numbers, similar to the base set and many other issues of the time, it nevertheless features a few Hall of Famers, including Lee Smith, Gary Carter, Dave Winfield, and Nolan Ryan.
Most notably, the set features the first Fleer card of Chicago White Sox legend and Hall of Famer Frank Thomas (though Thomas had rookie cards from other manufacturers issued during the season).
Today, the complete set can usually be found for affordable prices, though top-grade copies of the Thomas rookie can bring decent money.
Check current eBay listings for 1990 Fleer Update cards here (affiliate link)
Checklist
U-1 Steve Avery
U-2 Francisco Cabrera
U-3 Nick Esasky
U-4 Jim Kremers (RC)
U-5 Greg Olson (RC)
U-6 Jim Presley
U-7 Shawn Boskie (RC)
U-8 Joe Kraemer (RC)
U-9 Luis Salazar
U-10 Hector Villanueva (RC)
U-11 Glenn Braggs
U-12 Mariano Duncan
U-13 Billy Hatcher
U-14 Tim Layana (RC)
U-15 Hal Morris
U-16 Javier Ortiz (RC)
U-17 Dave Rohde (RC)
U-18 Eric Yelding
U-19 Hubie Brooks
U-20 Kal Daniels
U-21 Dave Hansen (RC)
U-22 Mike Hartley
U-23 Stan Javier
U-24 Jose Offerman (RC)
U-25 Juan Samuel
U-26 Dennis Boyd
U-27 Delino DeShields
U-28 Steve Frey
U-29 Mark Gardner
U-30 Chris Nabholz (RC)
U-31 Bill Sampen (RC)
U-32 Dave Schmidt
U-33 Daryl Boston
U-34 Chuck Carr (RC)
U-35 John Franco
U-36 Todd Hundley (RC)
U-37 Julio Machado (RC)
U-38 Alejandro Pena
U-39 Darren Reed (RC)
U-40 Kelvin Torve (RC)
U-41 Darrel Akerfelds
U-42 Jose DeJesus
U-43 Dave Hollins (RC)
U-44 Carmelo Martinez
U-45 Brad Moore (RC)
U-46 Dale Murphy
U-47 Wally Backman
U-48 Stan Belinda (RC)
U-49 Bob Patterson
U-50 Ted Power
U-51 Don Slaught
U-52 Geronimo Pena (RC)
U-53 Lee Smith
U-54 John Tudor
U-55 Joe Carter
U-56 Thomas Howard
U-57 Craig Lefferts
U-58 Rafael Valdez (RC)
U-59 Dave Anderson
U-60 Kevin Bass
U-61 John Burkett
U-62 Gary Carter
U-63 Rick Parker (RC)
U-64 Trevor Wilson
U-65 Chris Hoiles (RC)
U-66 Tim Hulett
U-67 Dave Johnson (RC)
U-68 Curt Schilling
U-69 David Segui (RC)
U-70 Tom Brunansky
U-71 Greg A. Harris
U-72 Dana Kiecker (RC)
U-73 Tim Naehring (RC)
U-74 Tony Pena
U-75