Entrepreneur Ryan Naylor pitched his company, Esso Watches, on Shark Tank in 2012. He said that using a negative ion technology, his Esso Watches could restore the body’s “energy field” and improve balance and flexibility. On the show, Shark investor Mark Cuban called the product a scam, saying the ion idea has been disproved. When Naylor offered Cuban a sample, Cuban refused it. Naylor did not get an offer on the show and said afterwards, “It frustrates me that Mark Cuban clouded the water for the other sharks.” (Naylor faced another problem after the show: Exxon Mobil claimed a copyright over the name Esso, which they've owned for more than 100 years.)
The Esso Watches website is no longer around but its Twitter account points traffic to the watch website Tagi. The Tagi watch does not claim any health benefits, nor is its name owned by one of the world's largest companies. It’s just a simply designed watch available with a black or brown leather strap, and in 36mm or 40mm case sizes. It's available for $119.00 (free shipping included).
[Note: Other TAGI-branded watches in a silicone style appear on Amazon, though these may not be related to the company as they don't appear on the Tagi site.]
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