Why do you want to sell one and keep one? Is it for the money, or do you just want to only keep one watch? The Constellation is quite valuable, but that's the one to hold onto if possible. The more you research it, the more you'll realise how good it is and the more enjoyment you'll get from owning it. The Seamaster is ok, just so-so IMO and I have the same doubts as Davidt about the capital S.
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