2016MO LIBERTAD REVERSE PROOF ONZA NGC PL70 FIRST RELEASES. WORLDWIDE MINTAGE OF 1500. 999 Fine Reverse Proof coin is certified by NGC as PL70. The coin is the first ever reverse proof 1 OZ Libertad released by the Banco de Mexico. There are only 1500 coins worldwide. Very few of the coins have been graded. Secure your First Releases coin now for a lifetime investment. AMERICAN NUMISMATIC ASSOCIATION LIFE MEMBER.