If a 40% silver blank got into the Denver Mint process flow, upset, and struck, it should look exactly like a normal clad $1 - except for color and absence of copper on the edge. The photo pair supplied by the OP shows two coins with different basic designs; rim shape of R and other details seem different. The shallow reeding is also troubling -- it should be identical to that on a Denver coin.... Of course, it might not have been struck at D or SF, but at P. Will be interesting to see what NGC has to say.