http://www.smu.ca/academic/science/geology/bios/victor_owen.html
A lot of Wistar attributed glass has now been made possible because of Mr. Owen's work.The two bottles shown here have the gall (white yellowy looking substance with the texture of cement grout) in the pontil seen only on glass manufactured at Wistarburgh.The vial is small at only 2 and 3/8s in length and 5/8s in circumference.The cylinder shaped utility or med bottle is the same in color but stands 6 inches in heigth and 2 and 3/4 inches in diameter.Both bottes have the familiar Wistar yellow green color in them.My best guess is the vial is very old made in the early years of the factory 1739 to 1760.The utility bottle shape was more prevalent after 1760 so my best guess is the 1760 to 1782 period of the glass factory.The pontil on the utility bottle is one of the prettiest I have ever seen or held.Although Wistar glass is rare you must remember they were in business for 43 years with the 20 year period just before the American revolution being very prolific and profitable for Caspar Wistar and then is Son Richard.Their glass is out there in our antique bottle market as hundreds of thousands of pieces of glass were made there in 43 years of manufacture.