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The product is a 2011 Struve miniature sheet of stamps. 
The stamps feature historical events and are colored blue. The quality is described as mint never hinged/MNH and the grade as XF/S (extremely fine/superb). 
The certification is uncertified.

Friedrich Georg Wilhelm von Struve (Russian: Василий Яковлевич Струве, trans. Vasily Yakovlevich Struve; 15 April 1793 – 23 November [O.S. 11 November] 1864) was a Baltic German astronomer and geodesist. He is best known for studying double stars and for initiating a triangulation survey later named Struve Geodetic Arc in his honor.