The 39's are very common. However, I went through mine and found 2 that had the 1938 reverse and those have a premium. IDK maybe yours is VF? There's really no market for the 1939 circulated, even if the book says it is worth 15 or 20 cents, a dealer isn't going to give you 10 cents for it, and sell it for 20 and make a huge profit.