So... is Gamba no Bouken finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Gamba no Bouken
Adventure of Gamba
Anime - Base
Release date: April 07, 1975
Gamba to Kawauso no Bouken
ガンバとカワウソの冒険
Anime - Sequel
Release date: July 20, 1991
Synopsis
Gamba, a spirited and adventurous mouse, embarks on a journey with his companions, eager to witness the vastness of the ocean.
Their carefree travels take a serious turn when they encounter a wounded mouse bearing tales of a ruthless white ferret named Noroi.
Noroi's reign of terror has plunged the mouse community into despair, prompting Gamba to make a courageous decision.
Driven by a sense of justice and compassion, Gamba and his friends resolve to confront Noroi and liberate the oppressed mice from his cruel grasp. They set out to face this powerful enemy, knowing the dangers that lie ahead.