5227 although I'd recommend it in R, which I think suits this reference particularly well (and is the version I own). The larger 39mm size of the 5227 also wears well both now and into the future.
Previously I owned a 5015R which is nice, but at 35mm small by today's standards and frankly I didn't find it very comfortable on the wrist either, which is why I got the 5227R (the hinge case back being a standout feature on the 5015 and especially on the 5227).
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