There was a major project undertaken for Dublin's millenium celebrations in 1988 when the city celebrated its official 1000th birthday. (However, the area has probabally been settled for much more than 1000 years, that's just a random date that was taken by the City Council at the time)
Some are original, some are repros. They've been electric since the late 1800s so I'm not 100% sure how many of them would have been gas to start with.
[This message has been edited by djk (edited 09-18-2006).]
