I recently bought some very expensive preamp tubes from a well know dealer. They were advertised very clearly as "NOS in nice original boxes. 1950s/60s." They arrived with the printed labels in one case worn completely off and in the other badly worn, and with what looks to me like clear evidence of heat on the pins. One of the NOS tubes in question: And in this picture, and actually almost new tube, with the "NOS" tube visible in the upper left corner So it looks very clearly to me that this is a used tube, and a pretty heavily used tube. I've bought NOS tubes before and they have been what is I understand NOS to mean, "new old stock, unused." The dealer claims the labels are worn off in handling and testing. He offered me a refund, and I plan to return these ASAP. But this looks like BS to me. Am I missing something here?