You pay shipping! Appears to be a survivor Schwinn Westwind 26 x 1¾" Brick, I looked it over really well and find no slices, delamination, or dry rot, just hard as a rock dried out! I wouldn't suggest it for a daily ride but, I would ride it!
Muscle bikes; https://en.m.wikipedia.org/wiki/Wheelie_bike
Wiki nails this one. Antiestablishment handle bars, wheelie seat and a stance that says, "badass!"
When running silly sized tires and gearing I have used the small ring bolted to a coaster sprocket to reach an acceptable ratio. The biggest coaster I find is 23 tooth...
I'm a pretty skinny fella, the big seats hurt the bottom of my cheeks!
While I don't suffer back problems I did notice the Adamo really lessened lower back stress. It's goofy to get used to. Very flat.
I feel the rest of my "rider" saddles would shock most, bigger isn't always better!