great b4 picts of that bike by the way, and i base my theory on the camelback top tube vs a dual cantilever, which roadmaster was useing by 57' and 58'. the chairing on yours looks like a 57 thru 59, to me, but i am basing that off amf useing one style chainring in each year for all models, which may be incorrect. i guess it does make sense that a few modles, like yours, retained the one piece/camelback, top bar a bit longer than to say like a skyrider, perhaps.
