That information is a bit outdated, use this instead:
https://www.calibre1040.com/cal-1040-collectors-guide-dials/
I do have a steel Yachting with a silver dial, unfortunately no extract -- although extracts for 1040s don't always indicate a dial color. And I've seen no period adverts either, nor have I seen that dial on ANY period adverts, catalogs, or marketing materials - on a 176.010 or any other watch. But we know it exists, and my serial number research tells me it tends to exist within specific clusters or batches.
So it is hard to come to a firm conclusion, but my personal opinion is that it was a legit dial for the 176.005, 176.007 and 176.010. Not many 1040 dials were legit across multiple references, but this one seems to be.
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