I have a strong preference for the 1969 SeaQ and its 39.5mm size. I would have liked a longer power reserve than 40 hours, but even that might not deter me from getting one, as it is a model I strongly consider adding to my collection. We'll see.
My vintage (i.e. plexy) Rolex models spend all their time in the safe as they no longer fit my daily activities. My Explorer II 16570 is s much better fit for that, and although it's market value has been increasing, it's not at a silly level where I would think twice before going to the gym with it
It always baffles me that this watch gets so little press vs. a Daytona or a Speedmaster, considering its lineage and history. I guess it's a good thing, as they are to be found second hand at absolute bargain prices compared to what you get for the money, from a top notch brand.