If the 1976 bike runs well, it is probably a good buy. However, if it makes a fuss about starting up, and runs really reluctantly, then it is probably not a good thing to spend money on. The later bikes are much better than the earlier, but they are more expensive also. If you look around you may find a better bike, for similar money - but if you feel the bike offered by the trusted man is a good one, go for it.