6.5 inch wrist should be absolutely fine. I'm at 7.25 inch or so and it just looks too small (I could justify the size to myself but it would always nag me).
Those who fit a 36 well should count themselves lucky as they have a bigger pool of models to choose from and they are less costly. I was trying to persuade myself on a 36 to be "classic" but just didn't work for my tastes and size.
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