This set of stamps from Russia, issued in 2003, features two famous nuclear physics scientists. The stamps are in mint condition and have never been hinged. The quality is VF/XF (Very Fine/Extremely Fine) and they are uncertified. The stamps are from the type "Block of 4" and were produced in the time frame of 2001-2010. They are a great addition to any stamp collection, especially for collectors interested in science. The stamps depict the scientists in a beautiful and detailed design, making them a great display piece as well.