The easiest way of obtaining chapter and verse of the periods during which J. R. Gaunt held a Royal Warrant is to contact the Royal Warrant Holders Association and ask them to look at their records. That's if you really want to get to the crux of the discussion.
Printed material can vary depending on when it was printed and who printed it so I would not get to wound up about that. At the end of the day, it's really academic. The firm no longer exist.
Dave.
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