My nephew, who is going to college in Japan, brought me 3 coins for Christmas. I am not sure where he bought them but they were probably under $20 for the 3. One was easy to identify because it was from 1644-1661 Emperor Shih Tsu, however the markings on the back said it was made at the Su mint. Was that mint used at that time? The next was harder and I think it was Yung P'ing Yuan Pao coin from Emperor Kao Tsu 907-918.
The last one, pictured here, I cannot identify. The reverse is blank. The script appears to read top, right, bottom, left instead of the normal top, bottom, right, left. Looking for examples on the internet, I found this most common for Sung (Northern and Sothern) Dynasty. I could not find any emperor close to the top and right symbols. Please help me identify this coin. Thank you.