Explorer 3-6-9 is a G-hook

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Apologies if this is well established, but I hadn’t noticed it before. The 3-6-9 numerals on the 5 and 6 digit explorers seem to be in the shape of a G-hook - very common type of clasp on hiking, climbing, outdoors/recreational and tactical gear. Apple also drew inspiration from it too, it seems. Not sure if coincidence or intentional by Rolex, but fitting and appreciated either way!