Vintage Pratt & Whitney Aircraft JT3D Engine Ashtray.
It is in very good condition, it is white ceramic, made in the USA by The Lynmark Company, it measures 7-3/8\" square, the underside of one corner has a chip (please see pics), the colors are bright and clear, does not appear to have been used.
The JT3D was an early turbofan engine used to power the Boeing 707, Boeing 720 and the Douglas DC-8.

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