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Wow! This little exercise has really been fun! :)

My pleasure!

So, the "12" helps confirm that the second line is in fact an address: 12 Grand Viziers Street, Arras, France!

(Ya gotta love Google Maps!!)

While I can't ID the razor, the imprint on the tang sure looks French to me: "Caudron" is a name used in France, and there's a Rue des Grands Vieziers in Arras, a town in northern France, not far...