I think you are mistaken in a couple of areas, the dial definitely didn´t start out that colour, it was probably a kind of silvered white/cream/champagne type of colour, much the same as this 2652.
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@cicindela was pointing out the patina having all the hallmarks of nicotine and the spots you mention could well be from a cleaning attempt sometime in the past. The oxidation spots are not connected to the nicotine staining, but either way the dial colour is what gives your fathers watch its character.
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