1.75” with trivial dust on the backpaper by Bainbridge of Syracuse. Green rim has few dots of white as printed. Woodrow Wilson supported the concept of the 8 hour day and in 1916 the Adamson Act established that, with additional pay for overtime, for railroad workers. This was the first federal law that regulated the hours of workers in private companies. The Supreme Court upheld the constitutionality in 1917. This button was used to show support for the legislation with the various initials standing for the groups Brotherhood of Railway Trainmen, Brotherhood of Locomotive Engineers, Brotherhood of Locomotive Firemen and Enginemen, Order of Railway Conductors. An important labor button and the only example we’ve seen. Exc. and displays Mint.