The price of a Xianfeng Tongbao with a "Dang Qian" (thousand) inscription on the reverse, a die mother coin, varies widely depending on factors such as its condition, historical background, and market supply and demand. At a 2015 auction, a Xianfeng Yuanbao with a "Baoquan Dang Wu Bai" (500) inscription, with a diameter of 55mm, sold for 460,000 yuan. Another Xianfeng Yuanbao with a "Baoquan Dang Wu Bai" inscription, with a diameter of 60.4mm, sold for 2,185,000 yuan at a domestic auction in December 2013. At a Japanese auction in 2022, a Xianfeng Baoquan Dang Wu Bai die mother coin fetched a high price of 230 million yen. Furthermore, there have been reports that the price of a Xianfeng Tongbao (with a "Dang Qian" inscription) die mother coin was 1.8 million yuan. These prices demonstrate the high value of Xianfeng Tongbao with "Dang Qian" inscriptions on the reverse, die mother coins, in the market, and also reflect their rarity and collection value. Thank you for viewing.