Silver Royal Society of Arts medal, [presented to] Professor Henry E Armstrong, PhD, LlD, DSc, FRS, for his paper on "The Indigo situation in India" session 1921-1922. 55mm diameter. Obverse, left-facing profile head of George V King and Emperor Patron, MCMX [1910], signed B.M. Reverse, Laurel wreath round inscription Royal Society of Arts Manufactures and Commerce. Rim inscription.