This is the very first Ovation Adamas prototype 12 string acoustic guitar..The first 26 adamas guitars were prototypes.This is the first 12 string and possibly the only 12 string in the prototype group 1-26..I have been told that this is serial # 12 but i have no confirmation. The guitar has two round soundholes on the upper bouts.It has an access door on the back held on by tape.I was told the door was used to shave the bracing to adjust or voice the sound of the guitar.see pics...The top is black graphite and the back is the ovation lyrachord bowl.Both were never painted or finished.The guitar is very playable sounds great.It is a great piece of Ovation history.Built around 74-75.The later production models came out in 1976..guitar comes with original ovation case which is in good condition..email all questions to samova@aol.com.I can take more pics if needed