Ross had a varied history, yes. Cr-Mo is Chrome Molybdenum alloyed steel. Good stuff. The blue bike frame looks to be much higher quality than the complete bike - the cantilever brake bosses on the blue frame and the forged dropouts indicate that it was originally a fairly high end bike. The other one is made of 1020 HiTen Steel, not as good as Cr-Mo. And yeah, they were made in Allentown, except for the ones subcontracted out (cheap ones to Asia, really nice ones to American builders, the Signature line).