First off, every 1976 Eisenhower Silver Dollar has two years on it – 1776 and 1976. These dates marked the 200 th Anniversary of American Independence. Secondly, not all the coins were minted in 1976.

A 1971 U.S. silver dollar prototype will be up for auction for the first time via Heritage Auctions live on Jan. 14—while online bidding for the coin that began last month had hit US$69,000 as of ...