Is it an adult size model or child's? Does it still have a head badge? Several cycle companies made chain drive tricycles. Of the children's models, most common are Colson, Murray/Mercury, and Taylor. A couple other brands of chain driven trikes I've seen are American National (Skippy) and Stelber and I'm sure there's a few others around. As with any other tricycle of the era, value is based on original condition. Make and model figure in there too, as some like Murray are much more common than other makes. If you get someone with a camera to take a shot, please post it...I'd like to see what you have.
Dave