The US believes that Pyongyang itself procured a Swiss-made Intaglio press sometime in the 1990s.

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These cylindrical pieces of stone, some barely an inch in length, were incised with intaglio designs featuring gods and animals.

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The front of each note will feature an image of Queen Elizabeth II, a hand engraved intaglio portrait based on a photograph by Mark Lawrence.

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Though some of the archaeology had been damaged by the market's construction in the 1800s enough remained to show evidence of buildings on the site as well as a large amount of pottery and various other items such as intaglio gemstones used in jewellery.

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