Manufacturer: Warwick China
User: Hotel Pennsylvania
Date of egg cup: circa 1922 – 1935 (based on historical evidence, not backstamp)

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Notes: The 10-story, 600-room Hotel Pennsylvania located in Philadelphia, PA was designed by Clarence Edmund Wunder and completed in 1922. From 1927 to 1935 the hotel was listed as the Hotel Pennsylvania. From 1937 to 1945, it was the Philadelphian Hotel, and in 1948, it became the Penn-Sheraton Hotel. In 2007, it was the Chestnut Hall Apartments, part of University City, surrounded by the University of Pennsylvania.

For related info:
Pennsylvania Hotel 2 by Maddock Pottery Co.