Two huge Chinese characters - Ban Liang ("Half an ounce"), outer rim / Blank, no rims. 32mm, 6.62 grams. Hartill #-; ZhongHuo page 146 (rarity 8).

These rare coins are local issues that belong either to the late "Warring States" period or the early Qin period. These early ban-liangs with an outer rim are rare.