Actually, not really in terms of the way the 57 co-axial wears. I own it and the Speedy Pro. The 57 co-ax is, when you put it face to face with the Pro, actually marginally larger all around the front of the entire watch due to its bezel size. The lugs are a bit longer than the Pro's, too. And of course it's thicker. The result is a watch that actually wears a bit larger, not smaller, than the Pro. I love both and lately find myself wearing my 57 co-ax more than any other watch I own. But don't let Omega's case size specs fool you into thinking the 57 co-ax is somehow smaller than the Pro. It most definitely is not.
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