I agree, the bike looks like it is probably "legit".
Early 70's Colnago Super.
A straight side-shot photo would be nice.
The Rear Derailleur, Front Derailleur, cranks, and hubs, and headset all look like they may be originals.
The shifters, handlebars, and brake levers are all probably not original.
That era of bike may or may not have had shifter braze-ons or top tube cable guide braze-ons.
Lots of paint chips, but I can't tell if it has any dents from the photos, or what it would take to work them out.
$300 to $400 might be a good price for all involved. Higher is more in the seller's market. Lower is more in the buyer's market.