Looks decent. Seems to be about a model 80, 1972. Check toe first 2 digits (3 on later models) of the serial number on the frame neck and engine and go here to see the models:

http://cemoto.tripod.com/bultaco.htm

Fred Z.

At 10:35 PM 7/1/2009, you wrote:

[ Attachment(s) from G Paul Roberts included below]

Just bought my second Sherpa blind off the internet (After a 30 year break, and countless other bikes)  bike advertised as one owner 212 miles only.   It is a bit rough but I am in two minds on how original it is.  Has a couple of period (I think) after market parts and mods, tires, exhaust and a Preston Petty rear mud "Mudder"..   Sort of thing I might have done during the same time period. 

Fred Z.

There are two secrets to success:

1. Never tell everything you know.