Just pulled mine from the garage to clean 'er up. No serial# or any other discernible stampings/engravings under the bb shell, fer sure.

Many frame details are very similar---lug type, general lug shape, seat lug scallop/treatment; chainstay bridge almost looks fillet brazed.

I've got the fastback stays, though, and my fork crown is the full-sloping Cinelli internal-plug crown. No rack/fender mounts on the rear drops. And it looks like my top tube brake casing guides are a little more thinned.

....and my seatpost is very stuck, first time that's happened to me in a looong time. Fortunately it's stuck at the right height.