thanks to both noglider and bianchigirll.
I would be inclined to agree concerning the current groupset? it is obvious that the bike has been very well looked after in the past and much loved.
as for the fir nettuno wheels, i suspect the rims were as suggested retro fitted and in their day were probably fairly high end, they ride relly smoothly. ever since taking ownership of the bike i have been sure it was previously owned by a keen cyclist, he or she changed a few components to keep the bike on the road. i truly feel lucky to be able to continue in the same vein. i still have to pinch myself when i think i got my bianchi for just $89. i will post a pic in due course, but alas i must confess to being a little tech illiterate.
thanks again
rob
just found out that after non-production for 6 years 'fir' are back in business.