Be sure to add me to your favorites list Original Vintage Casio / Casiotone 310 (CT-310) Electronic Keyboard Operation Manual Owner's Manual Book, Made in Japan. This is an original full User's / Operation Manual for the very early 80's vintage Casio / Casiotone model 310 electronic keyboard (also known as the CT-310). This manual is in good condition, with most of the wear, marks and some discoloration the covers, with some on the pages as well. This booklet has great information in both English and Spanish sections. This is a very helpful owner's guide if you have one of these fantastic vintage Casio keyboards, and a neat collector's item now too! Original Casio document, made in Japan! This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thanks for looking! Check out my Store!