It's just "Dutch Tavern," not "Dutch's." Great bar. I love the room. Peter the owner is a great guy, and he makes a very good, basic burger, among other things. Also a proper pour of Guinness, and one of very few bars where you can still play pinball.
It was called The Oak in the pre-prohibition days when Eugene O'Neil hung out there, but it's the same room with the same tin ceiling I believe. Green Street is one of very few blocks in downtown New London that was not burned when Benedict Arnold ordered the raid on New London, so it's cool that those buildings were there then.