Seneca Water Goblet, 5.875"
In this second example, Seneca has copied St Louis' Trianon pattern, which was introduced circa 1834. Again, the Seneca is .25" shorter than the original St Louis version. Visually they are indistiguishable.
St Louis, France, Water Goblet 6.125"
Here is an exmple of an American luxury glass manufacturer copying a much older French pattern. The original St Louis stems were .25" taller, the only real way to distinguish them. Both share the same high quality workmanship. In this instance, the St Louis piece has the addition of red casing, cut to clear.