The subject of Assos saddles came up a while ago. Here is one on Ebay:
http://ebay.com/
I had (have) several of these. In the 80's I considered them a reasonable substitute for Unica-Nitor #3's, which even then were getting somwhat scarce. Or else nobody who I asked knew where to look!
Best Regards,
Wes Gadd
Unionville,CT