Warring States sword, the Warring States period is the transition period of weapons from bronze to iron. There are many forging masters, such as Ou Yezi and Ganjiang, among which Gou Jianjian, the King of Yue, is the representative.
Han Jian originated in Jian Qin (in my opinion, the shape of the steel sword in the Han Dynasty is very similar to that of Jian Qin unearthed in the Qin Tombs, and it has been improved-probably because it is more slender and sharp based on superior materials), and its length is not less than that of Qin bamboo slips.
Tang Jian, handle, almost like tangdao. Blade, between Han Jian and Ming Jian, with four sides, hard body and thick ridge, inelastic feel, and the fitness gradually narrows from bottom to tip.