United States of America
 
serie 6 overview
 
Date of issue: 13.06.1974
Value and Mineral:
 10 C - Petrified Wood
 10 C - Amethyst
 10 C - Tourmaline
 10 C - Rhodochrosite

Particularity: color reverse
left = normal
right = color reverse
petrified wood normal petrified wood color reverse
amethyst normal amethyst color reverse
tourmaline normal tourmaline color reverse
rhodochrosite normal rhodochrosite color reverse