From what I understand the 77 was actually quite rare as far as production is concerned. The total run from 75-77 was just over 100,000, but the 1977 cb400f only saw a production level of just over 5,000. I would say that makes them a little more valuable. 6 speed transmissions were a bit of a rarity for the time period as well. Just my two cents. (which might only be worth a penny in today's economy.)