Yi Hua or Yi Tao - State of Yan / China (ancient)

Hello.
Please help to identify this coin: Yi Hua or Yi Tao - State of Yan.
What currency should be specified?


Thank you.

here is an old book (safe to download).
Perhaps you will find some more information
https://mega.nz/#!iwhW1CqB!QLqccTKmLF5ZV6fxvsPG1k_M_pILubdtDt3nQNn1o9o

Hi,

Regarding to my quick research, State of Yan mainly uses Knife coins and Spade coins for transactions.

Square-holed coins also exists but rarer. These are called "Won" coins (圜錢)

3 known types found so far for Won coins of State of Yan. They are "明多", "明化", and "一化" (Yi Hua).

So, among the two denominations, I pretty sure 1 Hua was the right one to the corresponding coin.

Reference:
https://kknews.cc/zh-hk/culture/6lqn9q.html