A unique pair of leather shoes designed by Adidas and German porcelain maker Meissen Krater Vase that could become the first sneaker to fetch $1 million were put up for sale at a Sotheby’s auction on Monday. The pair of trainers are based on Adidas’s popular ZX8000 model and painted by craftsmen from Meissen, news agency AFP reported.

The record has already been broken several times this year, most recently by a set of Nike Air Jordan 1s that Christie’s sold for $615,000 in August.

Sotheby’s has set the pre-sale estimate high at $1 million for the Adidas-Meissen shoes, which are not meant to be worn.

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The low estimate is one dollar in an attempt to encourage bidding, but auctioneers expect the final price to be at the higher end.

“There is that shift in the market looking at these sneakers as art,” AFP quoted Brahm Wachter, director of e-commerce development at Sotheby’s, as saying.

The sale runs online until December 16. Proceeds will go to the Brooklyn Museum in New York for its young persons program.

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According to the official website of Sotheby’s, “the ZX8000 shoe model, is adorned with 15 of the Vase’s 130 different patterns. Ensuring the pair’s unique place in history, each pattern has been painstakingly crafted with the utmost care and precision by four individual painters across three separate Meissen departments.”