As a collector of namesake bottles, I always prick my ears up when I hear about a Dunn's bottle. This one is by far my best, this was bought through a US collector on the Aussie forum a couple of years back, it is an early hinge mould Dunn's Coffee Essence from the UK, and are extremely sought after in the UK as well.
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https://i110.photobucket.com/albums/n120/abcreview/dunnsessence.jpg
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https://i110.photobucket.com/albums/n120/abcreview/dunnsessence.jpg