This is a yellow light cover that can go flush at the ceiling, or it can be inverted. It has a deep vein like alabaster. It is bright and clear, but it has old world charm.
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Based on the photos and information provided, and subject to examination, this is:
An Art Nouveau style studio art glass ceiling mount
American or European, early 20th Century
Of variegated amber glass with a marbleized appearance, the bowl-shaped form with scalloped rim and ribbed body. Interior of lower rim with standardized electrical labels.
7 inches high, 18 inches diameter
PROVENANCE: acquired at auction
*represents a fair-market value for auction purposes; retail or asking price may vary.