This is a Tonga 1967 Pa'anga coin made of Copper-Nickel to commemorate the Coronation of Taufa'ahau Tupou IV. 

It has been certified by PCGS with a grade of MS66 and has a certification number of 47053220. 

Low Mintage of 13,000.  Only 3 coins have graded higher - All three graded MS67.  Wonderful representation of Tonga history.