For the Yuval guitar inquiry I believe the luthier (or inspector) As I am not certain of the quantity output of the company would be Jack Habedeck which is signed handmade in my guitar also. I believe the one in my posession is an F 103 model. Excellent tone,bound both sides as well as up the neck and headstock. The one I am using now appears to be Sapele solid wood body and neck. With a solid spruce top.
I have no idea of the age or the value as I did not buy it new. Anyone wishing to contribute information can e mail me at   revmarvinplayer@gmail.com         Best Regards.