The picture below shows a larger view of this 1965 Boston Building Trades Council AFL-CIO Advertising Pin Back Button. This celluloid pin back button is imprinted in green and red on a gold background. It pictures a map of North and Central America, two union marks on the edge, and two union marks embossed on the back. It is marked on the front and edge as follows:
BOSTON BUILDING TRADES COUNCIL AFL - CIO 1965 BASTIAN BROS. CO. ROCHESTER, N.Y.
The pinback button measures 1-1/4'' wide. It appears to be in mint condition as pictured.