Nice bike, and helpful info from forum members.
I have a newer Sintesi that was dated by I believe Barb at Tommasini.
Try using these contact links.
http://www.tommasini.com/eng/contatti.php
or
info@tommasini.it
Send them serial numbers and pics.
They have been helpful with my questions, and kind when we visited their store a few summers ago.
My kids ended up with t-shirts.