Barn Find Survivors and Affect on Hagerty Value

I’ve recently come across a true barn find (1977, 1-owner, completely stock vehicle with 23,000 mi). The condition is somewhere between Good and Excellent but I’m wondering what additional value is typical to tack on to a true unmolested survivor.

Generally speaking, when looking at a real survivor’s value it can run above what the corresponding condition is in the Hagerty Price Guide. It all depends on the vehicle and what other paperwork or porvenance comes with the car, but a “good” car could realistically carry close to the value of an “excellent” car. If the vehicle is something rare or has popular appeal, then there could be more, but this is speaking as generally as I can.