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Collecting Heisey Glassware - By: Collectibles-Museums.com, 2009-02-18 In 1900, the Heisey trademark that makes pieces so easy for collectors to identify, the H encased in a diamond figure, began to be applied to the pressed glass. You can put your finger into the piece and feel the mark with your finger. Beware, however, some pieces are not so marked. For example, the pieces that were blown, some of the most valuable ones, are not marked in this way. COMMENTS Add a comment |