Instructions
Determine the type of Fostoria piece you are looking at. Some of the earliest glassware in the American line were the "Boudoir" pieces. A prized and rare old American pattern of the Boudoir set is the Boudoir jar, often confused with the regular quart jar. Other earlier and more limited pieces include the hurricane lamp, mustard jar or inkwell, hairpin box, and molasses can.
Weigh and measure the glassware. Older Fostoria American glassware is heavy. Newer pieces, sometimes made with the same molds, are lighter. A reference book will give the exact measurements. Measurements off by 1/2 inch indicate a new piece.
Look at the glassware under good lighting. Authentic Fostoria American pieces are clear, crisp and easy to see through. Newer pieces often appear dull. Fostoria used a fire-polishing technique.
Feel the edges of the glassware. The Fostoria American pieces have sharply defined edging. New pieces have a more rounded appearance and feel. The distinct raised-cube design stands out against a flatter look-alike.
Know the years that Fostoria made the American pattern in color. Most of the American pattern is crystal with no color. From 1925 to 1927, some pieces were introduced in azure blue, canary and light green. In the mid-1950s through 1963, the American line was available in white and light green milk glass. Toward the end of production of the official American line, a cobalt blue was used. Other colors indicate the piece is part of Depression glass, made by Jeanette Glass, or from the Indiana Glass Co.
Visit an antique dealer to get hands-on experience comparing the weights and quality of the pieces. The American pattern is readily available, and the shop may have some look-alike pieces, which are collectible in their own right. The earliest look-alikes were the Cubist pattern made by Jeanette in the 1930s.