Identifying glass

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. Stiegel-type 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 ca…