There's only been 1 silver clad 1976-P. And an earlier post said that unicorn was a proof. So this would be quite a find.
Celebrating 200 years of the Declaration of Independence ? Back of Ike - is that the cracked Liberty Bell ?
A special 1 year design for the bicentennial coins, and then they went back to the original reverse (1971-1974, 1977-1978).