On March 1st, China issued the 4th group of the current definitive series: Great Wall, Ming Dynasty. The eight stamps are:
                5c, Hushan Section
              20c, ShanghaiGuan
              40c, JingshanLing
              80c, MuotianYu
            270c, PingxingGuan
            320c, DeshengKou
            440c, YanmenGuan
            540c, ZhengbeiTai
The stamps have a size of 25x20mm, perforation of 13. Beijing Stamp Printing Works print the stamps in sheet of 50 (10x5)