From the research I have done so far, I believe it is considered an “Intermediate” model and was most likely made in 1976. I played it through high school and then my daughter did the same. serial #165711. I tried to reach out to a music dealer near me to see if he could give me a value, but he referred me to e-bay, and there were no c13’s listed for sale. Could you please help me to determine its value. Thanks.