Thread: How to tell the original book format?
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Old 10-12-2014, 02:55 AM   #9
eschwartz
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One thing that might help, if the Kindle book originally came from Amazon then it will have an exth 113 field, otherwise known as ASIN. calibre will record that as the mobi-asin identifier-type metadata during the Add books process.

If the book has a mobi-asin, it can be assumed that the original format was an Amazon-sourced MOBI/AZW3.
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