09-06-2010, 06:06 PM
Dave ...Good research and neat project ! If it helps, the class light lenses were nearly-clear uncolored plastic molded with a circular (Fresnel) pattern over the bulb cavity...usually the color-filter was unseen unless lit. Earlier markers used a metal bezel and a glass Fresnel lens, which was often individually replaced with the newer units due to age or damage. Bob C.
James Thurber - "It is better to know some of the questions than all of the answers."