Manufacturers: Jackson China, Mayer China, Walker China
User: Colony Club
Date of Jackson plate: 1972
Date of Mayer demi cup: 1992
Date of Walker plate: 1966

Mayer demi cup found in a Syracuse China dumpster, marked as a sample

Walker China plate

Jackson China plate

Colony Club flag, New York City

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The ID was made based on a photo of the flag that flies outside of the club's building that clearly shows the same deep blue logo.

The logo is a pair of interlocked, blue shaded Cs in a serif font, backwards and forwards. Keyword: rwcnCC

Sources:
Wikipedia
Big Apple Secrets

Jackson China photos, courtesy of Andrew W H Campbell; Walker China photos courtesy of Jesse James Schroeder; Mayer China photos courtesy of Susan Phillips
Flag photo courtesy of Yelena Linetskaya, Big Apple Secrets