About two-thirds of the way through the bidding at the Premier Napa Valley trade auction Saturday, auctioneer Fritz Hatton announced that the event’s total wine sales had already surpassed the previous year’s record proceeds. When the last of the 200 special lots of Napa Valley’s finest was sold, total sales for the 2012 auction were close to $3.1 million, a 29-percent increase over last year. “This is incredible,” said Terry Hall, communications director for the Napa Valley Vintners. “I mean, this is the first time we’ve ever broken $3 million. That’s just phenomenal.”