Found this strange 3-sided poison today...two flat stippled panels, ounces/CC graduations between the two flat panels, and a round back (similar shape to the ubiquitous 1920's amber poisons). Bottle has design patent No 104574 on the base and was made by the Obear-Nester Glass Company, St. Louis, Mo...that design patent was issued in 1937 so it dates to around that time. Anyone seen one before?