An officer selling without the notice prescribed in sections 626.74 and 626.75 , shall forfeit one hundred dollars to the defendant in execution, in addition to the actual damages sustained by either party; but the validity of the sale is not thereby affected. [C51, §1907; R60, §3312; C73, §3081; C97, §4027; S13, §4027; C24, 27, 31, 35, 39, § 11725; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §626.77 ]