Is this error worth anything? The indented squiggly line isn't a scratch. It looks like it was made in the coin.
First, welcome to the neighborhood! It looks like a strikethrough to me. It was probably caused by a piece of thread or string. Errors like this are usually a one-of-a-kind occurrence, but that doesn't mean that they are all that valuable. It depends on how many people might want it. Chris
Yes, I saw that it was a proof coin. It still doesn't change my answer. Granted, proof coins are supposed to be handled much more carefully, but even then, oversights fall through the cracks. Here is a 2005-S Silver Proof KS SQ lamination error that I've had ever since I received it from the Mint 12 years ago. Chris
If you search the Error Coins forum for "lamination errors", you will probably find dozens of examples. Here is another of my favorites on a 1935 Buffalo nickel...... Chris
Agree that it looks like a strikethrough, however to make that kind of impression I doubt that it's string or any other type of soft material. My guess would be wire, as is exampled here: http://www.error-ref.com/struck-through_wire/ . Now having said that, given its length and sinewy character I'd certainly love to know just what it was from and how it got there; especially in a sealed proof set. As to value, who knows? It is interesting, especially so given the fact that it's a proof set, and most likely worth more than the current market price for the proof set itself . . . but one thing to remember, your error set and others similar to it will not make you rich, more like the difference between getting a coffee at Mickey Ds and one at Starbuck. However, I think it's interesting, you obviously think it's interesting, and on that alone it's worth holding on to until the day you no longer find it interesting (or want a coffee from Starbucks)! Semper Fidelis
No. It wouldn't have a value to warrant the cost of having it graded. A good rule of thumb that I and others use is; if the coin is worth $200 or more, then it's worth getting graded. Only exceptions would be bulk submissions, where the cost gets averaged and gets low, or taking advantage of a sale at the graders.
Sorry for the delay, but my wife had me digging a trench for an electrical feed to our new hot tub! At any rate, couldn't agree more with Beefer518; no sense to have it graded unless you find through market research that the type of error you have has achieved a value at the level noted above. Besides, it is sealed in a proof set case so you're certainly not going to damage the coin. If you like it, wrap it up, put it away, and then you can take it out every so often to take another look at it. Semper Fidelis