IBB International Brotherhood of Ship Builders Blacksmiths Screwback Pin

International Brotherhood of Boilermakers (IBB) screwback pin issued for 25 years of service, representing the International Brotherhood of Ship Builders, Blacksmiths and Boilermakers.

Condition: Used with scuff / scratch marks, wear, aged enamel, etc. Screwback version. Please review all photos for exact condition of item and size.