G. N. B'k
In 1897, a bank was opened in Minot, North Dakota called the Great Northern Bank. While I can't confirm this cancel was made by this bank, it is my best guess. Anybody with an old check from this bank from July thru late 1898 on could help confirm my guess.
James J. Hill's Great Northern Railway passed through Minot; the railroad founded and was largely responsible for the growth and building of the town.
The Great Northern Bank of Minot would become the 2nd National Bank of Minot