Unique Royal Leerdam "De Lindeboom" Art Deco Slag Glass Lidded Box This scarce lidded box is a premier example of Dutch Art Deco design from the renowned Royal Leerdam glassworks. Produced during the late 1920s, the piece belongs to the sought-after "De Lindeboom" line of pressed glassware. The lid features a striking architectural ziggurat shape, rising in sharp geometric steps toward a central peak. These angular forms reflect the machine-age aesthetic favored by pioneering designers like A.D. Copier at the Leerdam factory. The body and lid are crafted from deep purple slag glass, showcasing a unique marbled pattern of swirling white and lavender tones. Because the molten colors were mixed by hand, no two examples of this model possess the same distribution of clouds. The underside of the base bears a clear molded mark identifying its origin and brand heritage. It includes the text "Fabrikaat Leerdam" alongside the "De Lindeboom" name and a central logo of two figures under a linden tree. "De Lindenboom" was the client (the margarine factory) that commissioned this luxurious glass box, designed by A.D. Copier, from Glasfabriek Leerdam as a gift for their loyal customers. Today, these boxes are sought-after collector's items for enthusiasts of Leerdam glass and Art Deco. The box stands as a distinctive artifact of 20th-century European industrial design and decorative arts history. Its heavy, pressed-glass construction and bold proportions make it a standout addition to any modernist glass collection. An accurate inspection of the item reveals that the geometric lid remains in perfect condition with no visible flaws. The base of the box is in near-mint condition, showing only three tiny sharp edges or fleabites on the top rim. These minor imperfections are common signs of age for pressed glass and certainly do not detract from the overall decorative value. To ensure it arrives in its current condition, the item will be professionally and safely packaged for its journey. This exceptional find will be shipped fully insured to the winning bidder to provide complete peace of mind.