New answers tagged copula
2
It is certainly a form of です, but it is a dialect rather than an archaism. According to this, using でがす is seen in Kanto region and up, but sporadically.
Apart from real dialect, でがす is used to indicate unrefined character, which may be the case with the sentence in the question. A typical character is an untidy guy, maybe with beard, who is a 子分 type -- I'm ...
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