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Green gold, Rose Gold and WHITE gold are all created by alloying yellow gold with various metals. Green gold seems to have been widely advertised in the twenties but not much after that. It's really difficult to tell the difference in photos for a variety of reasons. It seems likely that the color differences you note do indicate 'green' gold. Because Bulova was, and still is a mass producer of watches, I hesitate describe any Bulova watch as rare although I recognize that some are not seen in public forums as often as others.