I can fill in the blanks on the glass manufacturer. The trademark is Water-Clear made by the Hyatt Glass Co., Poteau, OK. Hyatt set up in Poteau in the 1920s to make 5-gallon glass jars. They realized that they could also manufacture 5 and 10-gallon glass for visible gas pumps. They were out of business by 1932. I grew up 30 miles from Poteau and have relatives that live there. I have asked the relatives to keep their eyes open for cylinders, but no luck so far. I have Water Clear glass on my 10-gallon Wayne 519.