IMHO, vintage Universal Geneve Tri-compax for instance the steel ones are actually of higher value than gold. I think it is kind of similar with zenith where The price of G381is lower than a386 or a3818 etc. (All of which are also el primero). I am not sure about this zenith model because it is kind of not exactly that vintage yet by age. Anyhow, good luck with your quest to find a gold el primero.
Also I really think this model looks great
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