Uh, a dime. If you're referring to purchasing power, it's a bit hard to say because so many things are so different today. A stamp cost 3¢, a newspaper was 2 or 3¢, a bus ride or a bottle of Coke...
Franklin Roosevelt was still president in 1939 so his portrait wouldn't appear on a coin at that time. The first Roosevelt dimes were issued only following his death. If you have a 1939 Mercury dime,...
Assuming the coin is circulated and has no mintmark, the 1939 Winged Liberty Head dime is a common date coin. For an accurate assessment of value the coin needs to be seen and graded. Most coins show...