Have you ever noticed when you look at a Westmoreland Catalog or talk to someone about Westmoreland Glass, you may see a number next to a piece of glass or someone might explain a piece of glass with a number? Well, the Westmoreland Glass Company had approximately 3500 molds and one way they found to keep track of their molds was to give each one a number. The same number may be used for several molds with the same pattern, or the number may be exclusive for one mold. The numbers used can be traced back to when the molds were originated.

Asking for glass by a pattern name at the factory was futile as they recognized the pattern by line number.