I just got this used from a local bike shop and I think it might be a Merckx.
It's been painted and I have no idea where to start verifying the model besides the serial number... which only works if I'm sure of the manufacturer (which I'm not). The serial number is 16170 on the bottom of the bottom bracket, no letters in there anywhere...

It has rear Campagnolo-marked drop-outs similar to an early Merckx and also holds a Campagnolo headset and older caged-bearing bottom bracket.
There are no braze-ons anywhere except for the derailleur hanger... not even for water bottles. There are a few clamps holding a Campagnolo shifter mount onto the down tube and a smaller clamp for holding the rear derailleur cable housing.













I'm just hoping someone here could help me identify this thing.