I think you'll need an in, not just a phone number, if the part you're looking for even exists at the mother ship. You might try contacting a watch dealer in Europe, preferably Switzerland, and explaining your situation, i.e. "I would be willing to pay χ for this particular piece, if you can get it."
I have heard tell of dealers in Switzerland getting hold of replacement hands for an A386 within a couple of days though their factory connection. This dial might be a bit more elusive, however.
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