Waltham Scientifically Built Watch 1920 Ad
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Waltham Scientifically Built Watch 1920 Ad. This black and white November 13, 1920 ad states Proof. The most Scientifically built watch in the World. The Waltham Scientific and exclusive Process of Hardening and Tempering the Hair Spring in form. Picture shows the Waltham 7 1/2 Linge Watch. Also shows the Waltham Scientific Breguet Hair Spring Hardened and Tempered in Form Greatly magnified. Magazine tear sheet picture is taken through plastic and may show wrinkles or crookedness that is not in the ad. This original magazine tear sheet measures 8 inches wide by 11 3/4 inches tall.
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