Thanks again!
A rare bird that one, I think. Not seen one in the flesh. Not sure how long they kept that shape for but I suspect maybe not long.
The serial number thing is getting more confused but we'll keep at it. The date idea is a good one but I think your beast is older than that. On the off chance it is still the original engine, the date code on it may help to confirm.

To all you other greenfielders, send your serial numbers pls. Even just the number and a brief description of the animal it is off.

Cheers,