Hi Scott and Mod CJ,
This one seems to be a real bitsa.
It has an earlier Briggs engine and and a later Rover Chassis. The two decals are from a much later Rover Red 45, while the grass deflector plate comes from a 1977 era machine. This is due to it's original colour of "Apple Green" being revealed. Could you please furnish us with some more overall full general shots of the machine.
Personally I feel that this possibly has been a case of two machines being turned into one.
Cheers,
BB.