First, Beth Shaut of the Carder Steuben Shop in Corning responds to Gerry Eggert’s comments about the glass companies locations in Corning.
Sinclaire’s Cutting and Engraving Factory was across the Street from Denison Park which was at the other end of town from the Steuben Glass Works. They had blowing plants in Bath and Dunkirk NY. One reason for the companies being in Corning was it cost less to manufacturing here and access to the major railway system that ran past both businesses and connected with the major cities.

Next, John Styler asks the following:
Alan, the real novice here again!
I have never been so enamored reading the back and forth comments on a pieces of glass, hush John, their talking about ART !
This may be a foul ball in left field at this time but her goes. Our family purchased these service plates at Field’s some sixty plus+plus years ago. They were sold as Steuben by Fields and never questioned because they were interesting to my parents’, I have since learned from Jane they are not. The wreath is deeply cut and gold leaf inserted, then a paint like material fills in the open area. They’re sure not dish washer safe. One of our help once put one in water and the piece has slight damage because water got into the leaf area; Oh well, that guest will have to live with it that way because as a service plate one only sees the center of the plate for a second as the next course is served. I’m teaching my granddaughter what service plates are used for because she’ll get them and I’ll tell the guy they are not Frisbees. As the picture show the bottom of the plate is ground and probably made by WHO or WHOM?