How card auctions work

Most landmark card sales happen at auction, and auction results are the main public record of what graded cards are worth. Reading those records properly means knowing a few terms that auction houses use precisely: hammer price, buyer's premium, reserve, consignor. The examples below come from auction houses' own published terms and lot pages.

Hammer price and buyer's premium

The hammer price is the winning bid — the figure at which the lot is knocked down. Heritage Auctions' glossary defines it as the final bid price, excluding any applicable buyer's premium. The buyer's premium is a charge the auction house adds on top, paid by the winning bidder and kept by the house. The modern version was introduced at 10% by Christie's and Sotheby's in London in September 1975 and reached the US in 1977–79; major houses now commonly charge somewhere in the 10–30% range, often on a sliding scale.

Card auction houses publish their rates per sale. Heritage's terms state that the premium for each auction is published in the printed catalog and online; one 2016 Heritage sports lot page, for instance, lists a premium of 19.5% of the successful bid. Heritage's terms add a further fee of 5% of the hammer price for winning bids placed through third-party platforms such as LiveAuctioneers or Invaluable, and a 2.9% surcharge for card payments.

Almost every headline price for a card — and every price on this site unless stated otherwise — is the premium-inclusive figure, because that is what the buyer actually paid. Heritage's appraisal guidance explains why that convention is also the tax convention: an IRS technical advice memorandum issued in 1992 treated the buyer's premium as part of the purchase price, so fair-market-value appraisals include it.

Reserves, minimum bids and “no reserve”

A reserve is the minimum price the seller will accept; if bidding does not reach it, the lot goes unsold. Heritage's terms frame this as a “Minimum Bid” — an amount below which the lot will not sell — and say lots generally open at 40–60% of the low estimate, with the house able to pass an unsold lot or place a protective bid on the consignor's behalf. Lot pages often state the reserve openly: Robert Edward Auctions listed a $25,000 reserve on a PSA 8 1934 Goudey Gehrig that sold for $150,000, and a nominal $10 reserve on a PSA 2.5 1952 Topps Mantle that sold for $72,000. At the other end, an absolute or no-reserve lot sells to the top bidder whatever the price; the 2024 Fanatics Collect / Sotheby's live sale offered a PSA 5 1952 Topps Mantle with no reserve against a $120,000–$150,000 estimate.

Consignment: the seller's side

The owner who sends a card to auction is the consignor; the auction house sells it on their behalf and the owner keeps title until a buyer pays. Houses may charge the consignor a commission, usually a percentage deducted from the proceeds, and negotiate it privately in a consignment agreement — which is why seller fees, unlike buyer's premiums, are rarely published. This site does not take consignments or broker sales.

Bidding mechanics

• Maximum or proxy bids. Bidders can leave instructions to bid up to a limit on their behalf. Heritage's terms say it does not accept “buy” or “unlimited” bids.
• Extended bidding. Many online card auctions use a soft close: a late bid extends the clock, which discourages last-second sniping. Heritage's terms also reserve the right to reopen bidding after the hammer and to extend bidding if outages occur; the $12.6 million Mantle itself sold during extended bidding.
• Estimates. Pre-sale estimates and past results are guides, not limits: the 1952 Mantle above sold for more than double the previous record for the card, a $5.2 million PSA 9 sale reported in January 2021.

Where auction records are published

When comparing records, check three things: the grader and grade (an SGC 9.5 and a PSA 9 are different cards to the market), whether the price includes the premium, and the date. An appraiser quoted by PBS noted that all 85 of the 1952 Topps Mantles sold at auction in the preceding five years had been professionally graded — the grade is the first thing a buyer reads.