I bought these as NOS from Upscale Audio and they've had very little use; no more than 60 hours.
From the Upscale Audio website: Amperex gold pin 7308 - Labelled PQ, JAN and USN, all U.S. made. Typically 1960’s vintage. I have super premium for the truly obsessive. Ever so slightly relaxed on top. Liquid, smooth midband. Fabulous, slightly full bass. This tube used to be commonly counterfeited so be wary of others selling them at bargain prices.
I bought these and a variety of other premium tubes last year for a Vinnie Rossi LIO. I've since decided to go with Vinnie's DHT module, so am selling my 6922 types.
Will include PayPal and shipping at my asking price.