Castrol Aviator and Official Helicopter Blue Book 25th Anniversary Pin backs

This is a lot of enamel and brass pin-backs.

Included are: 

~Castrol Aviator in white with black and red print. They measure about 7/8" wide.

~Official Helicopter Blue Book 25th Anniversary dated 1978. This 1" diameter pin by Promos Express is cobalt blue and silver.

These pins are in very good pre-owned condition.