I'm specifically wondering how a 424 would look and feel on my relatively small 6.75" wrist compared with a 587 or 372.
Do the wire lugs make a difference, such that the Radiomir looks a little smaller and wears a little lighter and easier over the course of a day?
Your wrist size IMO is right on the boarder for certain 47mm models, also depends how tall you are and wrist shape IMO. I would go with a 249 or 232 as they do wear much smaller than the 587/372 due to the wire lugs bite down on your wrist vs lugs that are long and might stick out over your wrist like skis. And those two models have thinner cases as well with ETA movements vs the thicker case of the 424. I think your wrist at 6.75 will be well suited for a wire lug 47mm rad.