Guys, Hope everyone is having a great holiday season. I have a buddy who wants to trade me a 1969 Gibson ES-150 for some of my stuff. The guitar is walnut and appears to be in excellent shape and all orginal. Guitar has gold hardware and bigsby. Not being extremely familar with this model, what do you think this guitar is worth?? Trying to judge if it is a good deal.... Thanks in advance for your responses - really appreciate it!!