Hi there,
Sorry to join very late but there might be an additional aspect.
I have not (yet) used my ultrasonic bath to clean my Rolex bracelets, neither for vintage nor for modern Rolex bracelets. I know that the little screws, which fix the individual bracelet elements, are glued by Rolex with a tiny bit of Loctite (or another product). In my view, the ultrasound might loosen these fixations, mostly depending on agitation time and frequency.
Therefore, I would not risk a potential disassembly of one or more bracelet elements, which might happen during wearing the watch.
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