I would say based on size and how it is covering a large part of the coin you are looking at at least a 30% it to the value if not more!! It basically being the coin was UNC a huge it is basically like a new car that had all the doors keyed huge decrease in value !
It can often turn a coin that would otherwise grade cleanly into a details coin, if that helps at all. 'Price' is always in the eye of the beholder. That being said, that's a pretty nasty scratch on an otherwise clean coin. Too bad.
Staple scratch happend to me. I bought a nice Capped Bust Half. In removing it from the cardboard 2x2, the staple turned & punched through the clear film. A small scratch but very visible. When I submitted it to NGC, they graded it "Details" scratched.
I have a key date $5 gold piece that has a staple scratch and I sent it to NGC and they gave it an AU-58... I think it all depends on how deep and long the scratch is, and also how rare the coin is.
19Lyds mentioned a nifty way to remove a coin from a 2x2 in an other thread....... "NOTE: When removing coins from 2x2's (stapled of not) use a sharp toothpick to pierce the cello then fold the 2x2 at the piercing spot. The cello will cleanly tear and the coin can then be easily removed." And here I've been prying off staples with a sharp penknife for years. I've come close to nicking a finger or the coin itself so the next time I have to remove something I'm gonna try Lees' method. Heck of a lot safer...........
+1 That is what I do. Leave the staples, break the cello, and the coin comes right out. Just remember to stab the cello and not the coin.
If the staples are diagonally in the corners, another way is to use scissors to cut the corners off the 2x2. An X-acto knife also works well to cut the cello about half way around the 2x2 and the coin slips out very easily. Chris
The ANACS rep at our local show did this with a couple of coins I had in 2x2's. It was a real face-palm moment for me, even though I hadn't (yet) had a catastrophic accident while removing staples from 2x2's. "Why didn't I think of that?"
And why I always pounded the staples totally flat on the back had a coin in a 2x2 get scratched through the cello from a others staple in a plastic bag on the way back from an auction. Why I use PVC free flips for raw coins that are better then junk silver I buy em by the box of 1000
I use my thumbnail to punch through the cello then just push the coin out, simple easy and I've never scratched a coin doing it. Avoidable scratches like that make me want to scream. Although I did pick up a seated dollar for my 7070 cheap because I watched my dealer scratch it taking it out of the holder.