The steel Apollo 17 45th is one of a very, very small handful of 1861 Speedmasters that comes equipped with an on-the-fly easy adjustment clasp.
If you like the previous generations' bracelet design (I personally do!), I'd opt for the Steel. You'll see Omega release 3861 Speedmasters that have a combination of gold case + leather strap in future limited editions.
But it might be a very, very long time before we see a new Speedy Pro with this combo of non-taper bracelet + adjustable clasp.
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