bicycle montague sram sachs folding rigida cr-moly internal gear commuter | eBay
That 2001 model is the worst. So heavy, so nasty.
“I only sell this because the fat tyre issue is my latest interest. and more comfort for my anatomy”
He should go 650B 
Those FAG bottom brackets are really good quality too. Not quite as good as the SKF ones, but still excellent.