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Joel - I would have thought they would be smooth if genuine celluloid. I have just dug out a pair of 1960s or so vintage ones, and the material of the scales has the metal foil logo as Haim said,...

That sort of grunge is common - a cloth will hardly touch it. Steel wool 0000 grade or fine sandpaper will remove it. Don't go mad and change the plane of the inner surfaces, or the blade may close...