Please note that this is an S-6 tire. It will not fit on a standard 26" MTB rim. It was used by Schwinn for many years because Schwinn made the only rims that this tire would fit.
The tires arrived quickly and immediately fit perfectly on my 1960s Schwinn. They made for a comfortable ride and looked so good that my bike was stolen a week later.
TFB shipped the tires in perfect condition and packaging. I will buy my next tires from TFB although they may be even rarer than the S-6.)