I've been investigating what it's worth. It's full to the top, perfectly sealed, and stored on its side in the closet.
Here's the reply from the auction house:
Sorry it took a while to get back to you, but I was out of town. I found one bottle of 1929 Chateau La Tour Haut Brion retailing for $2200, so our auction estimate would be $ 500-1000, assuming it’s in excellent condition and was stored well. Our consignment terms are on our website. If you’re interested, and we can get the bottle by Thursday, we might feature it in our brochure with other wine we’re highlighting for our upcoming August auction.