SONG YUAN TONG BAO (Line variety)

Emperor Tai Zu (960-76)
Song Yuan Tong Bao 1 cash
Reverse has lines above, right, left or below
24.9-25.9mm, 3.7-5.1g

Hartill 16.2 i,k,m &o

There are four other coins with nail marks at each corner of the hole on the reverse. I don't have these yet.