This 16-page booklet has a salmon paper cover and was received with MA.317925.02. Its citation information is: Directions for the Use, Care and Adjustment of Polar Planimeters (New York: Keuffel & Esser Co., n.d.). Model 4211 is discussed on pages 4–5.
Compare the booklet to the version scanned by Clark McCoy, http://www.mccoys-kecatalogs.com/KEManuals/Planimeter_Polar/Planimeter_Polar.htm. According to the model numbers included, that booklet was printed between 1925 and 1927, while this booklet was printed between 1930 and 1936.
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