Put up some pictures of the worn and broken sprocket teeth. Given the condition of this bike taken out of a dumpster, my bet is that it was never ridden enough for cogs or chainrings to be worn or broken. Right out of the dumpster, this bike looks as if it has been sitting on a showroom floor without being touched for about 35 years. My bet is that those "worn" and "broken" teeth are shift aids designed into the drivetrain. This bike needs an overhaul done by someone who can properly assess the real condition of the bike. The only downside is the very large frame size. Too bad, I am sure that many, many very tall dads who went shopping in Walmart would happily pay a very decent price for this gem