And also sometimes imitated/faked in the period which itself is pretty fascinating.
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More like frequently faked. The big source was the low countries...formerly the Spanish Netherlands, a Spanish territory until 1714 when they passed to the Austrian Hapsburgs but, needless to say, commercial ties with Spain continued. They would have been keenly aware of the demand for Spanish barrels and, with Liege and at hand, perfectly capable of producing any number of very good copies.