The right to bid may be reserved expressly by or on behalf of the seller; provided, however, that notice of such reservation shall be posted, and shall remain posted throughout the auction sale in a prominent and conspicuous place where the sale is being conducted, in letters large enough to be reasonably visible to any person with normal vision who may attend said sale, reading substantially as follows:
SELLER RESERVES THE RIGHT TO BID ON ANY ARTICLE AT ANY TIME
(Prior code § 20-5-22)