At the risk of getting ahead of things, I do think it would be good to find a photo of the dial before-hand. Even if the watchmaker believes you, if this ends up going to an insurance claim, which is a possibility, the insurance company may want proof.
Are you sure you don't have any photos at all from before the service? If you had the watch for a while, you probably took some photos. Or if you bought it recently, maybe the seller has photos.
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