1. All officers within or without the state of Missouri now by the laws of this state authorized to take the proof or acknowledgment of any conveyance or other instrument in writing affecting real estate, shall have the power to take the proof or acknowledgment of any instrument in writing.
2. The certificate of the proof or acknowledgment shall be the same as now provided by law for the certificate of proof of acknowledgment to conveyances or other instruments in writing affecting real estate.
3. Any such proof or acknowledgment heretofore taken by any such officer of any instrument in writing not affecting real estate and which proof or acknowledgment was taken in conformity with the then existing law providing for the proof or acknowledgment of conveyances or other instruments in writing affecting real estate, are hereby validated and legalized for all purposes from and after the effective date of this section. It shall not be necessary to rerecord any such instrument.