Your pictures are a little blurry, but it looks like the coin was placed in an acid bath to clean it. The acid attacked the copper core showing on the edge first, resulting in the groove on the edge. That was done after it left the mint, so no added value, sorry
It could also be a dug coin. I have found several like this metal detecting. It's along the same lines though. Acids in the ground eat away the copper before the outer plating.
I lean toward Waxemm's thinking - a "pure" acid encounter should erase details on the devices as well. I wouldn't think the extra nickel in the cladding would matter much aside the relatively weak in-ground acids.
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use