Thank you for your attention! 

This is SOLOMON ISLANDS ELIZABETH II 1977 DOLLAR, NUSU-NUSU HEAD - SEA SPIRIT, UNC

Metal     Copper-nickel
Weight     13.4 g
Diameter     30 mm
Shape     Equilaterally curved Heptagon (7-sided)
Orientation     Medal alignment ↑↑
References     KM# 6