What is the value of a John Cobb signature?

The value of a John Cobb signature can vary significantly based on factors such as the medium (e.g., photographs, books, or memorabilia), the condition of the item, and market demand. Generally, authentic signatures of notable figures like Cobb can range from a few hundred to several thousand dollars, depending on rarity and provenance. Collectors often seek out such signatures for their historical significance and personal connection to the sport. To determine a specific value, it's advisable to consult auction results or expert appraisals.