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6217-7000 1964
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I'm a fan of the vintage black dial Certinas.
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Jules Racine branded Excelsior Park 40-68
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Certina DS Diver
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Gallet
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Waltham
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Certina
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My 4, plus a Waltham Bathyscaphe currently at my watchmaker...

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Those Jardurs are fantastic. Speaking of Gallet Flying Officers, here's mine which I love:
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Gruen
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35mm

One of my favorite brands. Here's mine with rare Pulsations dial and earlier generation thick lugs case
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Golden Gallet
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Silverwaves
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Gallet
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About 37mm across

Gruen
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Fantastic catch!

Yes, I believe Truman wore the very first execution with the black dial.