October 22, 1913 was when the Northern Pacific Rules and Specifications Governing Uniforming of Employes was to go into effect, introducing the brand-new NP buttons.
Interestingly, in 1913, NP employee uniforms were to be outfitted with black (hard) rubber 4-hole buttons, over which
1913: Hard Rubber on Uniform is the second installment of the 4-part Northern Pacific series in the WRBA Button Aerogrammes. Stay tuned for more.
The above is based on the National Button Society's Classification System.
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