This find comes from our friends at Hemmings Motor News. And this certainly qualifies as an interesting "What Is It?". This is a 1928 Grahm-Paige limousine, one of 15 or 16 built that would travel cross country promoting various products.
We certainly have never seen another, but despite the odd factor it caries, makes this classic one cool ride in my opinion.
Source: Hemmings Blog.