The components on each are remarkably similar. The orange 1977 has early Cyclone derailleurs, Gran Compe brakes, Sugino Mighty crankset, etc... just like the '81 does, but they came in an anodized black finish. I also get a bit of a Halloween feel from the orange and black motif on the '77; thinking about going with some silver braided Jagwire brake cables and a different color bar tape to tone it down a bit...