Looks like an insulated high-pressure tank, so ICC class 105 most
likely. The Atlas or Kadee tanks are a good starting point. The logo
on the side is for Smith-Douglass, a Norfolk,VA-based fertilizer
company. From a 1964 New York Times article:
"Besides its fertilizer production
and animal feed supplements, Smith???Douglass makes phosphoric and
sulphuric acid, nitrogenous tankage, anhydrous and aqua ammonia,
superphosphate and silica fluorides, potashes, nitric acid and
ground gypsum rock.
Its principal business is in the
tobacco, cotton, peanut and truck growing areas of the South and
the corn and wheat belt of the Middle West. It also makes
insecticides, pesticides, herbicides and defoliants. Total assets
approximate $58 million."
David Thompson