Undark Radium Luminous Material 1920 Ad
Undark Radium Luminous Material 1920 Ad. This color April 10, 1920 ad states Undark Radium Luminous Material, I want that on mine. Undark doesn't get dark in the dark. Some articles that use Undark are Watches, Clocks, Door Bells, House Numbers, Speedometers, fish bait etc. Picture shows man looking at watch in dark. 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 7 3/4 inches wide by 11 3/4 inches tall..
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