Accordng to the catalogs the tandem construction ceased in 1979 and no models of that desing are seen. I have a 1972 paramount tandem and it had same side drive and dual down tubes for the lady back and from the front not solo tubes. I would check the serial number stamps to see if there are any matching of asian suppliers to Schwinn it may be a newer ititeration by a psuedo schwinn. See the on line schwinn tandem info for Pics.