Thank all for the insight. I will raise my bid and assume I will buy the car if I have not offended the seller!
I am fairly sure that it is olive green paint code L274. It is original paint, and the car has never been wrecked.
According to this site (reliable?) there was no "lime green" offered in 1978:
http://www.adelgigs.com/911colours.shtml
Thanks again. Dickson