This might be the only one, anywhere: a NOS complete set of flat wound Fender Bass VI strings from the early 1960s--including a spare 1st string (high E) string. They are individually packed in the original parchment envelopes that each have the appropriate box checked identifying the string (e.g. 706=low E). The box has a type-written, perforated label, which reads: "Set No. 700 Electric Bass Guitar". The strings have never been uncoiled & the only time I have removed them from their envelopes to check for corrosion (none evident, visually in their uncoiled state). The box has shelf wear, discoloration, old discoloration from tape, & one lid side panel has separated at both corners. I will be adding more photos to better illustrate the condition of the box. As far as the structural integrity of a set of strings that is over 50 years old, I do not have a clue. I have a 1962 4-switch Bass VI & have strongly considered installing these on it--however, it currently has a set of flat wounds with the same dark blue silk wrap & they sound & intonate perfectly (well, as perfectly as a Bass VI will ever intonate). Neither the strings currently on my bass nor this NOS set show any degradation. However, I am considering this set as "Case Candy" for your own Fender Bass VI because I cannot guarantee that they will perform as they would have when they left the factory. I would encourage you to view them in the same light. Please, please ask questions; I want you to be happy with your purchase. I cannot accept returns.