This is what a '74 proof Ike is supposed to look like. In my hobbyist experience, only the '74 silver proofs toned in this distinctive manner. To my eye, this Ike is under-graded at PR67. It's a solid DCAM, as the axial-lighted images show. 

There was a time when I bought any Ike that had any toning on it. Now, being a lot older and a little wiser, I see no reason to hold on to "doubles" (or triples, or quadruples). Hence my decision to cull the collection. (Also, being a hobbyist and not a businessman in collecting, I'm more interested in minimizing my losses than in making a buck or two.) 

Compared to similar listings on ebay, this baby is priced to sell.