Some time ago I found a Radio Craftsman RC-500 (at the time, just about the same thing as this and regarded as equivalent quality) with KT-66's and boy, that pair of KT-66 were the closest match of any tubes I've ever encountered. Within 1/2 mil all the way. I bought it for $25 and sold it on ebay for almost $700.
I think I will look for a local user and seek a favorable trade. I hate the idea of paying 15% to ebay, although I recognize that without ebay, I wouldn't have the widespread exposure. Most of all...I hate the idea of paying ebay a commission on the gross amount of SHIPPING when inevitably, I lose $5-20 at the UPS counter. Yes, I can overcharge for shipping and refund the difference and this is what I usually do. Still, it's not a profit center; I aim to charge only what actual costs are on shipping.
"As long as it's not absolutely trashed you don't make a git-tar rig out of it and that one looks to be in great shape!"
I would never consider modifying this for geetar use. It has too much fetish value the way it is. This (the Mac above and the R-C below) is/are exactly how I got it/them, complete with storage dust. Probably the best outcome is to find someone who wants it in a trade for something interesting.