I've seen this before, it probably encountered a set of environmental conditions where the inner copper reacted with something more than the outer one, which has a higher composition of nickel.
📋 Item Submitted
1965 roosevelt dime. If you look at the ribbed edge there's 3 layers to it. The 2 on the outside appear to be correct because they have the nickel finish and the 1 in the middle appears to be copper and bronze. When you look at the edge parallel to your eye the surface is concave. Got it back in change from a convenience store. Any pertinent information about this would be greatly appreciated. Thank You for your time and services.
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
Similar Appraisals
1943 silver "winged" liberty dime. .900 pure silver. Has the D stamped on the…
You got some fancy paperwork for a silver dime worth $1.50. Don't use terms like "broadstrike," makes it sound like a civilian…
1994 P dime
Go by the marked value: one dime.
1966 dime,
Face value.