
That is definitely a North Dakota state stamp. The tricky part is that the state shape has been rotated 90° CCW to fit in the coin's blank space.

In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024