All liens created by a decree rendered under Sections 28 and 29 of Chapter 62, Laws of 1901, (Sections 25-707 and 25-708, New Mexico Statutes, 1941, Annotated) against any property of a person shall be of no force and effect against any of said property after six months from the effective date of this act. Provided, however, that a certified copy of any such decree rendered prior to the effective date of this act may be filed for record with the county clerk as herein provided during said six months’ period in which case it shall be a lien from the date of the decree and any such decree filed for record after such period shall be a lien only from and after the date of filing with the county clerk.