Lot of 2 Castrol Aviator and Official Helicopter Blue Book 25th Anniv. Pins

This lot features two collectible enamel and brass pin-backs in very good pre-owned condition, still sealed for preservation.

Included are a Castrol Aviator pin, measuring approximately 7/8" wide, showcasing a striking design in white, black, and red. Also included is the Official Helicopter Blue Book 25th Anniversary pin from 1978, measuring 1" in diameter, presented in cobalt blue and silver by Promos Express.