I recommend you post at the IWC Vintage Collectors Forum:
That’s where the brand experts hang out.
My opinion is that there are very few people who could create that level of quality in a redial. What I have seen is that some watchmakers have found techniques for cleaning complicated guilloche dials that can bring them back to almost new condition. Sometimes, the price for the cleaning is that printed portions fade out or dissolve. That may be what happened here, although the style of the printing looks correct to me.
Hope this helps,
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