Thanks. I think I have a 1980 according to:
7268, Lawnmower, 1978 (SN 800000001-899999999)
7268, Lawnmower, 1979 (SN 900000001-999999999)
7268, Lawnmower, 1980 (SN 000000001-099999999)
7268, Lawnmower, 1981 (SN 100000001-199999999)
7268, Lawnmower, 1982 (SN A00000001-A99999999)
7268A, Lawnmower, 1986 (SN E00000001-E99999999)
My serial is 830810*
It seemed to run ok, until I stopped it since I almost ran over a bunny nest. Then it didn't want to start up. After that I may have flooded it. Seems to smoke a bit and almost seems a little too quiet.