A very good question. The only thing I can add to this is what I have seen(forty years). most were Chicago Cycle Supply bikes and were all diamond framed. One had a Chicago Tribune Special head plate. Two had the Chicago cycle supply tires(forget how they were marked). Have seen at least three times as many on restored bikes-most of these were also diamond framed bikes. I doubt these were originally decaled w/o the a.s. wheel-but look cool anyway!