Detective Comics #40 (1940) value

The sold value for Detective Comics #40 (1940) is $2,991.50 used, based on real eBay sold comparisons [1]. Today, sellers are typically asking around $3,500 for it on eBay [1].

This issue is highly valuable due to its age and historical significance, as it features the debut of Batman's sidekick, Robin. Condition and provenance can greatly affect its value, so grading or authentication might be worth considering for a precise assessment. You can compare current listings for this issue on eBay to see how it's being priced in the market.