'Dark mild', indeed. It's clearly a stout.
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Your Irishness is showing imo.
Mild used to a sort of weak, dark beer that used almost exclusively to be drunk in the midlands. All the rules have gone out the window now, with microbreweries and similar, though, so I've no idea what's what anymore.
I must say, though, that that looks more like a porter or a stout than the milds I've seen.