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1927, black surcharge "Servico Aereo" 500r on Official stamp 10r gray blue and black, block of four, very fresh condition, full OG, NH, F/VF and scarce, only 200 copies were printed, APEX certificate for block of 12, this block of four originated from the top right corner, C.v. $1,600 as hinged singles
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| Scott # C6A