Figured it out. It wasn't Calibre that was the problem, it was an old copy of the epub hanging around in the Kindle software that was being displayed rather than the newly minted mobi. The hint was when Calibre was showing the correct ISBN but the Kindle reader was not. Hopefully next time I'll have a valid question for the forum. Which is a cool forum, by the way. I hope to get to the point where I'll be able to help others rather than the other way around ...
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