Here are the differences in reflectors Schwinn used on the rear fender for Motorbikes and other models.

1935 and earlier reflector.  No Schwinn script and the glass was flush with the bezel.

In 1936 and later, the reflector protruded outside the the bezel slightly and HAD a Schwinn script on the
glass. They were made by Stimsonite, which also can be read on the glass.