Not at all a Cinelli. For about fifty years they're corporate signature was the fastback seatstay.
That said, it does look like a nice frame. Let's see if we can narrow it down any, what is the bottom bracket threading? Look for numbers and writing on the NDS cup. If you pull the fork it is very likely that the tube maker's name will be stamped on the steerer tube.
Most important, check it out thoroughly make sure it's straight and has the right seatpost, then tear it down completely get it painted or powdercoated reassemble and ride the snot out of it.