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A yellow jack is a flag used by ships as a warning of disease on the ship, or a fish, Latin name Caranx bartholomaei.
Apparently it's, Yellow.
Producers' Showcase - 1954 Yellow Jack 1-5 was released on:
USA: 10 January 1955
Celanese Theatre - 1951 Yellow Jack 1-18 was released on:
USA: 28 May 1952
This video connection is the one to use if there is no HDMI jack. It is much better quality than the standard yellow Video jack.