I had one about 8-9 years ago very similiar to the OP's bike. The weird thing about it was the BB. If I remember right it also had a 1pc crank, but used threaded cups. I remember trying to save the BB on the off chance I ever would need such a beast and not knowing which way to turn the fixed cup. Of course it was also not a standard size, so the wrench kept slipping. In the dumpster it went.