2009, SIERRA LEONE and GUYANA: Ferrari Formula 1 racing cars four different stamps in an IMPERFORATE block of four with horiz. and vertical gutters with Sierra Leone at left (Ferrari F2007 from 2007 and 126 C2 from 1982) and Guyana at right (Ferrari 246 F1 from 1958 and 500 F2 from 1952), MNH and a very unusual and scarce combination! (Image)