How do I find out what an antique map is worth?

Value depends on several factors: the mapmaker, the area shown, the age, rarity, condition, size, and whether it is an original or a later reproduction. Maps of popular regions and those by well-known cartographers often draw more interest. Decorative features, such as attractive borders and color, can also matter.

First, confirm it is an original. Reproductions are common, and many were printed on modern paper or as photographic copies. Look for signs of printing methods used at the time, such as plate marks from engraving, and check the paper's texture. A specialist can confirm this quickly.

Then look at recent sold results for the same map, and note condition issues like tears, stains, foxing, trimmed margins, or fading. For a map that might be valuable, contact a dealer or appraiser who specializes in maps and prints, or an auction house with a map department. Avoid repairs before getting advice.