Q: My grandfather was a photographer for Esquire magazine back in the 1940s and ’50s. We have a couple dozen black and white photographs of celebrities and are trying to determine their value. They include photos of the Andrews sisters, Irving Berlin, Bing Crosby rehearsing in a studio, Emmett Kelly performing, Clark Gable smoking as he’s walking down a New York City street, Jimmy Stewart sitting in a lounge chair and David Niven in his dressing room after a Broadway performance. We also have the negatives of most of these, but none of the photos are autographed.