Last Updated: Jul 19, 2016 Views: 99
According to our curator for American glass, Jane Spillman, numbers engraved on the inside of the neck were used to match decanters with their stoppers. The stoppers and bottle necks were ground to fit exactly and then both were marked with the same number. This was an English custom which was also used in the States. So the bottle/decanter with a number on the neck means it once had a stopper which is missing now.
The Corning Museum of Glass is currently closed to the public effective March 16 through April 22, 2020, as a precautionary measure for public health and safety. As a result, resources available to answer your questions are extremely limited. During this closure, you may be interested in searching our Ask a Glass Question FAQs or reviewing our Research Guides on various topics. We also highly recommend checking out The Corning Museum of Glass on YouTube for hours of artist demonstrations, lectures, and special events. Thank you for your patience.