I'm going to leave only one seamaster.

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Not sure how someone with 5 posts can “close this topic.”

Clearly, English is not the OP’s language, but most of us were able to interpret the request as “keeping one watch.”
Firstly, it was just a joke from my side, because, I think that for most of us here is not possible to keep („leave”) just one watch. 😉

Secondly, as a non-native speaker I understood his point so well, that I didn’t even notice the grammar mistake.