Fostoria Glass Co. manufactured the American pattern beginning in 1915.  In 1987, Indiana Glass Co., a division of Lancaster Colony began manufacturing some pieces of American-style glass.  This pattern is identified by the "ice cube" shaped look of the pieces.  Many imitations of this pattern have occurred over the years being distributed by Montgomery Ward, Princess House and Home Interior.  Fostoria's American pattern is heavier than these imitations.  Weigh pieces in your hand.  After practice, you'll note that true American has more mass than imitations.  Also, American is thick glass with good clarity (no yellowing)  and sharper edges.  Fostoria American bowls and plates have ground bottoms; imitations have pressed bottoms. Vases, candlesticks, bowls, etc. in American have three-part molds; imitations are two-part.  Looking carefully, one can clearly see the mold lines in the pieces. The most common imitation I see passed off as Fostoria is a round candle bowl w/ cover, sometimes called a "fairy light" (made by HOMCO for Home Interior), see first photo below. Some, but not all, of these lights are marked HOMCO on the ring at the base.  Other new cube styled pieces include a tall flared vase, cake plate and pitcher called Whitehall pattern made by Indiana Glass Co.  The original boxes for the pitcher and cake plate are included below.  This Whitehall Glass pitcher measures 8 1/2" high and the box states it holds 51 oz.  There is an original American pitcher listed as 8" high and holding 3 pints.  The foot of the Whitehall pattern pitcher is pressed, not ground.  The American pitcher is heavier in weight, has a ground foot and the "cubes" have more depth.  If one can enlarge the box photos, one can read the original name American Whitehall pitcher or cake plate and the prices of $5.99.  The Whitehall cake plate lists on the box a width of 12 1/2 inches.  The 3 footed American cake plate measures 12 inches.  These pieces may be a welcome addition to a collection of glassware but are NOT Fostoria American. Best practice when collecting a pattern is to have a listing of original American pieces produced by Fostoria.  These are available in many books on elegant glassware or Fostoria glassware. Go-alongs to your set may be desired but the monetary value is not equivalent to original Fostoria American pieces.