NGC 1977-S Jefferson nickel double-denomination struck over a 1977-S Roosevelt dime. The coin has the design of a dime under the nickel design, and two “1977” dates are visible. Also, the coin has a reeded edge.
Extremely rare, with only maybe 5 or 6 known 15c proof nickels on dimes.
PF68 Ultra Cameo with deep mirrored fields and frosted devices.