Random Ad - The Pen that signed the Versailles Treaty (1919)

Click to Enlarge

An advert for the Waterman's Ideal Fountain Pen which the makers claim was the type used to sign the Peace Treaty at the end of the Great War. 

Why does it say 'Of Stationers and Jewellers Everywhere'? Surely it should be 'From Stationers etc'

Watermans claim to have invented the first practical fountain pen in 1884.