Jeckyll & Co has dated this Georgian Copper Warming Flask to the 18th Century.
The detachable handle was perhaps to enable the owner to use the flask for warmth when travelling by coach?

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alternatively it may be a flask for an 18th century toper to imbibe an illicit toddy before bed...
Around 3 feet long in all, the diamater of the flask is 12".
Jeckyll & Co has dated this Georgian Copper Warming Flask to the 18th Century.
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