So... is Chivas 1-2-3 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)
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Synopsis
A powerful, albeit perhaps not entirely competent, sorcerer named Chivas Scotch takes on a monster-hunting job for a count.
Hired to eliminate a threat plaguing a village, Chivas finds himself in an unexpected predicament.
Due to unforeseen circumstances and a mission gone wrong, he is compelled to take drastic measures.
Specifically, he must transfer his essence into his servant Gin Fizz, leading to a potentially complicated and humorous situation.