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n 1900, when the ground was broken for the building of New York’s subway system, Tiffany & Co took a small amount of dirt from the first shovel and encased it in the back of a pocket watch. The timepiece, studded with old-cut diamonds and suspended on a gold chain, was given to the daughter of then New York City mayor, Robert Anderson Van Wyck, and was sold by Christie’s in 2022 for $US70,560 – around three times the pre-auction estimate.