Why is "Nagasaki trade coins" trending?

Wikipedia Overview

Nagasaki trade coins (長崎貿易銭), also known as Nagasaki export coins, refer to Japanese mon coins specifically cast for export by the Tokugawa government between 1659 and 1685 during the Sakoku era. Though the inscriptions on the coins often match Chinese coins from the Song dynasty they’re often cast with different typefaces such as the fact that the Genpō Tsūhō (元豊通寳) produced at Nagasaki was in Clerical script while the Song dynasty’s versions were in Seal script and Running script. Due to the success of these coins they’re often still found in modern day Vietnam and Java, and were copied by contemporary Vietnamese mints as they had become the de facto standard coinage in Vietnam as native production had declined in the 17th century. As the export of gold and silver was banned by the Qing dynasty Japanese merchants were most likely to go to Hanoi and Hội An to gain access to Chinese products causing these coins to start circulating en masse on the Vietnamese market. A special “5 elements” series of Nagasaki trade coins were also cast for export to Taiwan.