1942 Middle East Forces Nairobi, Foreign Occupations of the Italian Colonies. 1937-38 Great Britain stamps in vertical pairs overprinted M.E.F. second printing run called Nairobi typographic overprint in black 13.60 to 13.90 mm long. Type A, letters with blurred outlines and with dots of various shapes at the bottom of the vertical pair (in the 2½d above), and type B, letters with clear outlines with square dots at the top of the vertical pair (in the 2½d below). 1 new perfect vertical pair never hinged very rare certificate Dr. Giorgio Colla. The vertical pair with the two types of Nairobi overprint type A + type B are worth 50% more than the sum of the quotations of the individual series. Catalogo Sassone n. 1I/5I Euro 12500,00 + n. 1II/5II Euro 22500,00 + 50% = Euro 52500,00.