King Christian X (1912-1947)
25 Øre KM# 5, 25 Øre KM# 6, 50 Øre KM# 7, 1 Krone KM# 8 - 1926
5 Kroner KM# 9 - 1944
1 Krone 1926 include all three variants:
1. Normal heart above the lion in the middle
2. Hole in the heart above the lion in the middle
3. Hole in the heart [above the lion in the middle] and "double struck" (or "double die") of the upper and middle hearts.
King Frederik IX (1947-1972)
1 Krone - 1957 KM# 10, 1960-1964 KM# 10a
See images for correct impression