Glassmakers can be notoriously difficult to identify

Glass can be notoriously difficult to identify. Signatures, if there are any, can be faked, molds can be reused, and glassmakers often imitated one another’s decorations. Stiegeltype glass is an excellent example.We know that Henry William Stiegel came to Philadelphia from Germany in 1750. We know he had a glasshouse in Manheim, Pennsylvania, from 1763 to 1774. Confirming that a piece of glass…