Since I also own a neo vintage birthyear speedy, I can only recommend that one. Looks really great with leather and NATO straps as well. The 41 op is too large in my opinion (for being time only). Santos is great, but I would take the classic white dial. I like the planet ocean, but my save the ocean Seiko kind of does the same thing for me. The glass box is nice, but the speedy is the superior chrono imo.
Super hard to judge watch size in close up photos.
If the obvious thing are right (no lugs overhanging, no strange gaps) the best way I found is to look into a full body mirror or have someone take a photo of you and see how it looks.
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