what research?From my research it seems the Phantom was released in Sep of 1949. It is likely these bikes had Aug or earlier serial numbers. I think Schwinn was really just previewing things to come. While I wouldn’t call these ‘49 models I don’t really consider the early bikes ‘50 models either. As for the differences some of the early bikes, to include bonafide ‘50 models had Mesinger B1 seats. The early Phantom style seat didn’t have rivets and some of the early bikes had a teardrop Wald reflector. V/r Shawn