N.J. Stat. Ann. § 3B:3-6

An acknowledgment to make a will self-proved taken on or after September 1, 1978, but before October 11, 1979, pursuant to R.S. 46:14-6, R.S. 46:14-7 or R.S. 46:14-8 to make a will self-proved under N.J.S. 3B:3-4 or N.J.S. 3B:3-5 is a valid acknowledgment, notwithstanding that the certificate of acknowledgment does not have the officer's official seal affixed thereto.