Bejeweled and glowing gold in the light, the flagon is obviously priceless. A rich design playing across its side marks its owner: Care of MB, esquire.
Tome Unlock: In Nordland at 33.5k, 19.2k - Flask is found on some boxes behind the Merchant (the one next to the Career Trainer) in Breuer's Regiment (the town east of the Empire Warcamp 1) (Chapter 3), and sometimes on the back side of a wagon (facing away from the road) near the same Merchant. Right-click the flask to pick it up and right-click the item in your inventory to activate the unlock.
This tome unlock contributes to the The Mysterious M.B. pursuit.