This 1976-S Proof Type 1 Eisenhower Dollar is unique among Ikes, and all U.S. Dollars, of all years and types for being die struck both sides on a silver clad layer, composed of 80% silver and 20% copper. This Ike Dollar struck on a silver clad layer weighs just 4.03 grams, or 16% of an entire coin at approximately 24.624 grams. Other silver layer coins are known for Quarter and Half Dollar denominations that were die struck both sides, but this is unique for any Ike Dollar.
It is also struck using the original Type 1 Bicentennial design, used just for a short period of time before the change to Type 2.
This coin is currently in a PCGS MS63 holder as a Mint Error Struck on Ag Clad Layer 4.03g and the variety as Silver. While it has been designated as a mint state strike, in the opinion of the author and Mint Error News, the coin was struck with proof dies and has deep mirrored surfaces with a 50 year old original film. The Mint Error News staff examined the coin raw prior to being certified.
Silver clad Eisenhower Dollars were struck during 1971 to 1974 and for the dual dated 1776-1976 Bicentennial coins in 1975 and 1976, containing 40% silver. These coins have two outer layers of 80% silver and 20% copper surrounding a core of 20.9% silver and 79.1% copper. Each silver clad layer was approximately 20% of the overall weight but varied considerably between coins.