North Borneo 1918 Red Cross 2c + 2c green error, SG215aNORTH BORNEO 1918 (Aug) Red Cross 2c + 2c green error, SG215a An exceptional upper right corner block of four with the Type 69 surcharge and printed sheet number 58. This outstanding multiple features two horizontal pairs with the striking error IMPERFORATE BETWEEN. A very fine positional multiple with original gum and with the lower pair remaining unmounted mint, in overall pristine condition. This is the only known positional multiple of this error