An acknowledgment or proof of any deed, mortgage, or other conveyance to or by a corporation, national banking association, building and loan association, or savings and loan association at any time heretofore or hereafter taken by an officer authorized by law to take acknowledgments and proofs of conveyances and at that time owning or holding not more than one percent of the total issued and outstanding capital stock of such corporation, national banking association, building and loan association, or savings and loan association, and not then holding any office in said corporation, national banking association, or building and loan association shall have the same effect as if such officer did not hold or own any of such stock.