The coin shows evidence of circulation, so yes, it probably would have circulated with no problems; since it was still usable as a coin, the mint worker probably wouldn't have thrown it back into the melting pot if he'd spotted it. I doubt many people back then would have noticed.
As for value, "mint errors" as a general rule aren't as interesting on ancient coins as modern ones, because everything was hand-made back then. Coins with all sorts of errors on them are common, it's the perfect, error-free specimens that are unusual and command a premium. However, brockages are unusual on ancients - they're the sort of mint error a human-powered coin striker is more likely to detect and avoid than a modern machine. So yes, brockages are an exception and should enhance the value of this piece. By how much I'm not certain.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis