Same basic design as A-213. Has additional horizontal brass bar attached by brackets to the ends, out away from one side. Also an adjustable sliding magnifying glass (horizontal support present, glass missing) which can be moved and focused. Case is a rectangular box with hinged lid, two hooks. Company trade card and ivorine trade plaque inside lid. Comes with instruction book, "Directions for Using Thacher's Calculating Instrument," Edwin Thacher, published by Keuffel & Esser Co., New York, 1910." A-210 has the same trademark stamp as A-213.
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