That is interesting for sure.
I don't know that I ever recall having seen one with a jackshaft......not even in Grant's department store during the early 70's where they had every model of Muskin Cat the 'store' offered lined up out front. ( what a site....:drool: )
It reinforces my thought that the stores did not always carry the full manufacturers line of bikes, only the ones they thought their demographics could afford.
That bike is a very nice piece of machinery, and I would imagine is close to the top of the line for what Muskin offered.
Thanks for sharing.