So... is Kouya no Shounen Isamu finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: March 27, 1974
Manga finished: December 11, 1973
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Kouya no Shounen Isamu follows the journey of a young boy named Isamu in the vast and untamed landscapes of the Far West.
Driven by a deep desire to uncover his true origins, Isamu embarks on a quest to find his father.
His adventures are filled with challenges and encounters as he navigates the harsh environment and meets various characters along the way.
The story centers around Isamu's personal growth and determination as he faces obstacles and strives to fulfill his purpose, all while searching for the missing piece of his identity: his father.
Through his travels, Isamu will learn valuable lessons about the world and himself, shaping him into a resilient and resourceful individual.