Zenith Defy Gauss?

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Rare black dialed version (only 550 black ones produced, 600 blue, 950 silver, per Rössler), reference A7688, 1971-73. Water resistant to 300m.

Cool watch. The 2572pc inside is a replacement... should be 2562pc. Service crown. Should be on a lobster bracelet. Someone wanting to set it right with all these things should factor in maybe $600 for parts (those lobster bracelets are going at around $400 now). Then figure labor, including a dab of orange lume in the paddle sweep second hand as the finishing touch. I think the asking price would not be out of line for a perfect black Defy Gauss, with bracelet, so I would negotiate accordingly.
 
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Yep, 3500's sized it up perfectly. The Gauss was - as you might guess - the antimagnetic version of the Defy. Pretty rare and sought after, but this is not a great example, priced way too aggressively.
 
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WRUW watch of the day - thought to put it here for benefit of thread documentation.
"Silver" dial A7686 - 950 made per Rossler - ~1972 (bracelet dated 0672)
I would think it is more like a Grey Gauss 😀