西汉四铢半两钱始铸于文帝前元五年(公元前175年),罢于武帝元狩四年(公元前119年),历经文、景、武三朝,共铸行56年。《汉书·食货志》:“孝文五年,为钱益多而轻,乃更铸四铢钱,其文为‘半两’。除盗铸钱令,使民放铸。”据此知,有些四铢半两钱制作欠规范,皆因当时国家对铸钱放松管理,允许民间私铸有关,所以就造成了钱文上的版式差异,以及带有特殊记号和刻划纹 The Western Han Dynasty four baht half a dozen money was cast in the first five years of Emperor Wen Di (175 BC), took the Yuan Yuan Yuan four years (119 BC), through the text, King, Wu Sanchao, a total cast line for 56 years. “Han Shi Foodstuffs”: "Xiaowen five years, for the benefits of more and lighter, but more cast four baht money, the article for the ’half two.’ This knowledge, some four baht half the money produced less normative, because at that time the state to relax the management of cast money, allowing folk private casting, it resulted in money on the layout differences, as well as with special marks and scratches