Information on Sancineto's is very scarce. My efforts have yielded few results and I think you may have to find a connection in Italy to learn more about it.

I have a 1991 that I bought as a frame only, with the date information coming from the seller. Mine has original paint and stickers, including the shop who first sold the bike in Denmark. Here is a link to some info on my bike. I built it up with a mix of Campy 9 speed and VO parts and it is not period correct.

1991 Sancineto Road Bike | The Utah Randonneur

Yours looks newer that mine based on the name stamp on the seat stays. There are a couple of examples of mid 90's bikes here with that same feature.

Sancineto on velospace, the place for bikes

Sancineto Strada | Cycle EXIF

I'm going to say that your bike is going to be 1995-ish. I don't think that Sancineto built bikes much after that. They appear to have died in the late 90's along with almost every other high end steel frame builders in Italy.

Dating you components may also help. Of course they may not be all original but if its all Campy they may well be. Please post any info you may find. Us Sancineto owners need to share what we know about the marque to keep it alive!