Great thread! Some stunning speedies here. I bought this CB as a 50th birthday present to myself recently and will be wearing it on vacation to the Omega museum in a few weeks. When I was considering which cal 321 reference to add to the collection this is the one it had to be, since it's the reference worn by Jack Schmitt - the only scientist moonwalker of the Apollo program (geologist, Apollo 17). I've worked in research my whole career too, so I feel a bit of a connection.
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And below are a couple of images from the Smithsonian of Schmitt's CB...
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