Its a later 70s early 80s Pinarello frame that has been re-painted. Wrong decals have been applied. Columbus SLX new tubing is also wrong.
Would be good if you can check if the fork has the matching serial to the frame stamped in to the steerer tube. That would (also) prove that its a 1983 maximum (!) Because in early 1984 Pinarello switched to the "new" fork crown design.
You can take a small flashlight and investigate your seat tube. If it has the typical "reinforcement" stripes in it, its a SLX tubing (which I highly doubt here). By 1983 the only model that had SLX tubing were the very early prototypes of the Montello model.
However, yours cant be a Montello, since your frame does not have the typical triangle reinforcement with Pinarello logo on it brazed on to the bottom bracket shell.