In love with 3551 and 3954, but which one?

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Hi all I like 42mm watches and am about to pull trigger on one of these. Does anyone have a 3551 that can measure it? I hear Omega got it wrong and it is really a 39.5mm even though everyone says 42. I know the 3954 is 42 so is my backup. Thanks a lot!

These are my fav speedy watches!
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