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Black Goliath 1- 5 (1976)
I can't really tell if this was meant to be a limited series or a regular series. Marvel did not add limited series on short runs until the 80s. But during the time of this run, Marvel was trying to expand its audience to a more diverse group of people. So it may have been intended as a long-running series but did not get enough sales to keep going.
@BenjaminSpider It was meant to be ongoing. I was collecting Marvel at the time, and I remember them pushing it. Unfortunately, sales were lousy.