Another vote here for the Sinn. I have the 556 and (like you) an Explorer. They are close in spirit, but I still wear the Sinn often. Given the overlap with the Explorer, consider getting it on a strap. I usually wear mine on a nato or distressed leather strap.
I have the Explorer (124270) and the Pepsi (126710BLRO), the latter being my first watch with the cyclops. Anything around 3 gets imprecise. The Explorer is much more legible, and much easier to set.
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