I have a Kay that I am considering selling. It is serial #50755. Is there a way to find out what model this is and when it was made? The instrument is in good condition, and has a Barbera pickup installed in an adjustable bridge. It has been refinished, which according to the guy who has repaired and set it up for me actually enhances its longevity. How can I get an idea of what a reasonable price to ask for the bass would be? It is located in Iowa, has a soft case, and plays and sounds great. Thx for any feedback.