(a) This subchapter shall not operate to defeat the due enforcement of any writ of execution under any judgment for the recovery of money entered or recorded in the Superior Court, by virtue of which real estate is seized or taken, if such writ of execution is issued before the expiration of the said term of 10 years. They shall not apply to any judgment upon a mortgage or mechanic’s lien.
(b) No general lien which would have remained in force for more than 10 years under this section as it existed prior to June 23, 1955, shall be lost by virtue of § 4711 of this title or subsection (a) of this section, if within 1 year from June 23, 1955, such lien shall be extended in accordance with this subchapter.