Hello,
I recently received a 1 Cash coin from the Qing Dynasty and have identified the emperor as Qianlong. Here is the link to the coin: N#28089
I was wondering if anyone can provide me help differentiating between Board of Revenue type vs. Coastal Region Type, Flat Su vs. Curved Su, Tong with open head vs. Tong with closed head, etc. I have tried doing some research online but couldn't find much. I have attached some pictures of the coin below.
Any help would be greatly appreciated!