George Brett was one of the greatest third basemen in Major League Baseball history during his career spanning from 1973 to 1993 primarily with the Kansas City Royals. Brett was an 18-time all-star, won the AL MVP award in 1980, and had his number 5 retired by the Royals. Given his talent and accomplishments on the field, George Brett cards are considered quite valuable to baseball card collectors and investors today. The value of any vintage baseball card, even of a Hall of Fame player like Brett, can vary greatly depending on several important factors related to the specific card such as the year, set, condition, and more. For an ungraded George Brett card being offered for sale today, one must take all of these attributes of the card into careful consideration to determine its fair value.

While it is impossible to put a definitive dollar figure on an ungraded Brett card without examining the specifics of that individual card, we can look at valuation guidelines and sale comps for graded examples to get an idea of the potential range in value. The most valuable George Brett cards would predictably be from his early career years in the 1970s when he first came up with the Royals and started making a name for himself. This includes flagship cards from the 1970s like his Topps, Post, and Donruss rookie cards from 1974 which are considered the key date issues in the Hall of Famer’s collection. In Gem Mint condition grades of 10, high-end examples of Brett’s Topps, Post, and Donruss rookie cards have recently sold at auction for tens of thousands of dollars up to and even well above $100,000 depending on set, demand, and the presence of other desirable attributes like perfect centering.

For ungraded examples or those in lower grades, the values would obviously be much less. Using recent online sales histories and market data, here are some helpful valuation guidelines for different condition ungraded George Brett cards based on year and set:

• 1974 Topps rookie (good-very good condition): $1,000-3,000
• 1975-1980 Topps/Donruss/Fleer (ex-good condition): $100-500
• 1981-1990 Topps/Donruss (near mint-mint condition): $50-200
• 1974-1978 Post cereal/Kellogg’s (good-very good): $500-1,500
• Pre-rookie (minor league) issues from early 1970s (good+ condition): $200-800
• Oddball/regional issues from 1970s-80s (good-very good): $50-300
• Post-playing career insert/parallel cards from 1990s-2000s: $10-50

An ungraded George Brett card from one of his key early 1970s rookie season issues like 1974 Topps could demand $1,000-3,000 in good-very good condition based on recent sales. Meanwhile, a well-centered 1980s flagship card in near mint could ring in around $50-200. There are just too many variables without seeing the specific card to assign an exact figure. Condition, completeness, and presence of flaws or centering issues are major factors that could negatively impact perceived value. The best approach for a seller is to do research, examine comparables, and realistically price an individual Brett card for what the current market is showing as reasonable expectations.