it looks like mark two , as blumbly says plastic handle is a mark 4 .
but im thinking two because it may have the G4 throttle control but it looks a bit like there is a G3 chilling down there hence the other rubber pipe..?
more photos will answer this .
thanks man just thought id say just on the off chance as i have a mark 1 that im hoping to restore but its missing the lever and most of the auto drive parts.
cheers, tomo