Coin Item Number: Edz2701 from the MOA: University of British Columbia
Round, 4 sided hole in centre, rim around outer edge and centre hole, obverse 4 characters, no writing on reverse. Yongli tongbao (top-bottom-right-left) in seal script. Rim flaws, pits; extra metal in centre hole; rough fields.
Large sized circulating coin value 2. Made in Japan for Zheng Chenggong, with titles of Yongli. Zheng was subject to Yongli only when it suited Zheng's purposes; Zheng was a pirate-merchant.