Frank Thomas was one of the most prolific and powerful hitters in Major League Baseball during his 19 year career spent primarily with the Chicago White Sox. Known affectionately as “The Big Hurt”, Thomas smashed 521 career home runs and had a career batting average of .301 over 2,468 games played. His formidable hitting ability and durability at the plate have made his baseball cards some of the most sought after and valuable from the late 1980s through the late 1990s. Here is a breakdown of what are generally considered the top 25 Frank Thomas baseball cards based on their condition, scarcity, and historical significance:

1992 Fleer Ultra #366 – Thomas’ breakout 1991 season where he slugged .559 with 34 home runs and 109 RBI earned him a prestigious spot in the 1992 Fleer Ultra set. While not exceedingly rare, it marked an early opportunity for collectors to obtain a Thomas rookie card after his All-Star campaign. Graded mint examples in the PSA 8-10 range still trade around $30-50.

1994 Donruss #327 – The 1994 Donruss set had a printed run of only 150,000 packs, making inserts and parallels from that year in high demand. Thomas’ primary issue card remains attainable but parallels like the “Diamond Kings” parallel /50 or “Cooperstown Collection” /25 parallels fetch $100-250 graded.

1990 Bowman #497 – As a rookie in 1990, Thomas took baseball by storm with his prodigious power. His rookie Bowman card remains one of the more affordable from that decade at $40-70 graded. Signed versions bring $300-500 though scarcity has increased demand in recent years.

1995 Collector’s Choice Gold Signature #15 – This elegantly designed patch card parallels Thomas’ mammoth 1995 AL MVP season. With an ultra-low printed run estimated under 100copies, a PSA 10 now trades for $2,000-3,000 out of just a handful in existence.

1992 Fleer #366 – Considered the true Thomas rookie card, this issue debuted him on the checklist after his breakout 1991 campaign. Common but iconic, it remains a staple in collections valued near $20-30 graded. Authentic signed copies can fetch over $500.

1996 Studio #69 – Part of the highly regarded 1996 Studio set, this card featured terrific photography of Thomas in action. High grades PSA 9-10 command $100-200 as it was during one of his peak statistical seasons.

1997 Leaf Limited #50 – From the short printed Leaf Limited set c/999, this parallel featured a sepia-toned photo. High grade examples near mint pull in excess of $300 due to its ultra-rarity and commemorating Thomas’ back-to-back MVP awards.

1997 SP Authentic #95 – Featuring a sharp action shot, this popular insert set brandished authentic swatches of game worn memorabilia. Thomas’ patch card remains highly coveted at $400-600 graded near mint.

1992 Pinnacle #326 – Considered one of the sharpest traded from the early ’90s, this vertical issue commemorated Thomas breaking out in 1991. Higher grades above a PSA 8 hold appreciable $150-300 value long term for such an iconic card.

1994 Leaf Limited Gold #50 – Another parallel pulled from the scarce 1994 Leaf set c/50 copies, this super short print gold version honors Thomas’ awesome 1994 season. Just a handful are known to exist. A PSA 10 specimen would likely sell north of $5,000 if offered publicly.

1995 Upper Deck #269 – High quality photography and printing made the 1995 Upper Deck checklist prized by collectors. Thomas’ primary issue in pristine condition brings $150-300 depending on market conditions. Signed versions can reach up to $1,000 for authenticated copies.

1995 Stadium Club #79 – Part of the premium Stadium Club brand, this unique vertical design highlighted Thomas setting a new standard with his 1995 MVP season. Higher PSA 9-10 grades trade between $200-400 due to the set’s excellence.

1988 Donruss Best #4 – One of Thomas’ earliest rookie year issues was from the scarce 1988 Donruss Best set which contained fewer than 75 total cards. An unopened factory set sold for over $7,000 in recent years, showing high demand for anything related to his pre-rookie accomplishments.

1990 Topps Traded #T68 – Issued midway through Thomas’ rookie campaign after dominating the minors in 1989, this traded release previewed his breakout 1991. PSA 10 examples crack four figures due to the card’s timing capturing the onset of his legend.

1993 Finest #315 – Regarded as one of the finest produced sets of the decade, the premium 1993 Finest branding highlighted Thomas as one of baseball’s elite. Higher graded copies PSA 9-10 command $300-500 long term.

1994 Select #63 – Produced as a high-end competitor to Finest and Studio, Select became known for cutting-edge technology like holograms and embossing. Thomas’ issue there reflects the technological revolution and inclusion in such an exclusive brand.

1990 Bowman #497 – Considered the true Thomas rookie card after also being in Donruss’ 1989 set, his appearance here debuted him on the national scene after destroying minor league pitching. Two decades later, PSA 10 mint examples sell for over $800 untrained due to the card’s historic significance.

1992 Leaf Best #109 – An earlier parallel to the 1992 Leaf Limited set, this one contained 100 cards and was much rarer than other mainstream checklists. Higher grades PSA 8-10 sell for $500-1,000 long term making it a premium collectible tied to Thomas’ 1991 breakout year.

1997 SPx Autographs #100 – An incredibly rare pulled patch autograph sticker card distributed at about one per case of SPx. Considering the elusiveness of any autograph from this brand and late 90s superstar, a PSA/DNA authenticated one would likely fetch over $10,000 today if ever offered on the slabs marketplace.

2000 Topps Chrome Refractors #149 /399 – Produced during Thomas’ final season before retirement, these Chrome parallel refractors captured him in pinstripes for the White Sox one last time. Low numbered examples under /100 sell for $2,000-4,000 reflecting his lasting legend and the parallel’s scarcity.

1994 Score #750 Super Cub – Inserted roughly one per case of Score packs, this short printed parallel pictures Thomas’ childhood fandom of the Chicago Cubs before starring for the crosstown White Sox. Only a few dozen are known to exist, with a PSA 10 breaking six figures if offered publicly.

1994 Upper Deck SP #162 – Extremely rare inserted parallel from Upper Deck’s flagship set with an estimated printed run under 100 copies total. Capturing Thomas in all his glory during a peak season, a high grade example could easily surpass $10,000 in today’s hot memorabilia market.

1990 Bowman #497 – Considered his true rookie card after minors appearances only in other sets from the prior season like Donruss. In pristine PSA 10 condition with a sharp centered image, examples have sold for up to $15,000 in recent monster auctions reflecting its extreme importance to the hobby.

1993 Finest Gold Refractor #315 /150 – One of the rarest pulled parallel refractor cards ever produced, estimated at fewer than 50 copies known. As a parallel of one of the most renowned baseball sets combined with depicting the game’s premier slugger, there is no price high enough mentioned for the handful that could become available.

1997 Topps #1 – Featured as the very first card in the premium 1997 Topps checklist, this issue captured Thomas after winning back-to-back MVP awards and Major League home run titles. In pristine condition with perfect centering, a true gem mint PSA 10 specimen might be the single most valuable Thomas card in existence at over $20,000 raw.

In summary, Frank Thomas’ historic 19 year career producing at an MVP level for nearly two full decades has created a deep well of desirable baseball cards from the late 1980s until his retirement after the 2008 season. While common issues can still be had affordably, high grade specimens of his iconic Bowman rookie, early parallels, and ultra-rare insert cards continue rising rapidly as one of the most coveted collections in the hobby. Thomas’ prodigious power and longevity as one of baseball’s true “Iron Men” assures his legendary cards will retain their prominence for generations of collectors to enjoy.