1973 GMC Model S6H-4504A:  From RTA, Rochester, N.Y.  45 Pasengers, Suburban Seats, VS-2 auto trans, 6V71 Detroit Diesel

In my search for odd and unusual fishbowls, I wanted a small Suburban fourth series and found this one in Rochester, New York. 
Very few built.

Sold for scrap, Victorville, California