-134(2) A sale by auction is complete when the auctioneer announces its completion by the fall of the hammer, or in other customary manner. Until such announcement is made, any bidder may retract his bid; and the auctioneer may withdraw the goods from sale unless the auction has been announced to be without reserve, (3) A right to bid may be reserved expressly by or on behalf of the seller. (4) Where notice has not been given that a sale by auction is subject to a right to bid in behalf of the seller, it shall not be lawful for the seller to bid himself or to employ or induce any person to bid at such sale on his behalf, or for the auctioneer to employ or induce any person to bid at such sale on behalf of the seller or knowingly to take any bid from the seller or any person employed by him. Any sale contravening this rule may be treated as fraudulent by the buyer. § 1446. Risk of loss Unless otherwise agreed, the goods remain at the seller's risk until the property therein is transferred to the buyer, but when the property therein is transferred to the buyer the goods are at the buyer's risk whether delivery has been made or not, except that: (1) where delivery of goods has been made to the buyer, or to a bailee for the buyer, in pursuance of the contract and the property in the goods has been retained by the seller merely to secure performance by the buyer of his obligations under the contract, the goods are at the buyer's risk from the time of such delivery; (2) where delivery has been delayed through the fault of either buyer or seller the goods are at the risk of the party in fault as regards any loss which might not have occurred but for such fault. Article B—Transfer of Title § 1447. Sale by a person not the owner (a) Subject to the provisions of this chapter, where goods are sold by a person who is not the owner thereof, and who does not sell them under the authority or with the consent of the owner, the buyer acquires no better title to the goods than the seller had, unless the owner of the goods is by his conduct precluded from denying the seller's authority to sell. (b) Nothing in this chapter, however, shall aflfect: (1) the provisions of any factors' acts, recording acts, or any enactment enabling the apparent owner of goods to dispose of them as if he were the true owner thereof; or (2) the validity of any contract to sell or sale under any special common law or statutory power of sale or under the order of a court of competent jurisdiction. § 1448. Sale by one having a voidable title Where the seller of goods has a voidable title thereto, but his title has not been avoided at the time of the sale, the buyer acquires a good title to the goods, provided he buys them in good faith, for value, and without notice of the seller's defect of title. § 1449. Sale by seller in possession of goods already sold Where a person having sold goods continues in possession of the goods, or of negotiable documents of title to the goods, the delivery or transfer by that person, or by an agent acting for him, of the goods or documents of title under any sale, pledge, or other disposition thereof, to any person receiving and paying value for the same in good faith and without notice of the previous sale, shall have the same effect as if the person making the deliveiy or transfer were expressly authorized by the owner o f the goods to make the same.