Thanks for the replies.
The reason I ask is that I have had one of these little critters for more than 40 years (gulp!) and it really needs freshening up so I was thinking of a different scheme for it.
Originally it would have been light blue with red wheels, so where green came into it, who knows?. The wheels point to it being an early 40's model.
It appears to have the track set wide and a non standard downswept exhaust, but not have the cultivator lift mechanism, to me suggested a specific role - or maybe not!
I'd love to know more about the comms cable layer.
Edit to add... Now I've studied the pic closer, there's something very screwey going on with the wheel arrangement that I can't quite get my head around. Very strange.