1 JerryF 7 months ago My father in-law recently past on and left behind his guitar collection. So I'm researching this model trying to establish its worth. Link. The information I've found on this site so far has been nonconclusive. From the serial number I gather it is a 6120 from Jan 1968 however there are no markings on the neck head which this site indicates there should be. So is it possibility a 1956 model? The fact that it's serial number ends with 559 seems out of scope for those model years.