Mexico Airmail and Insured Letter Issue Sheet Accumulation. O.g. airmail sheets of C73, C75 and 39 sheets from 1950-65 issue, also a group of 51 sheets of the lock type insured letter stamps from $1 to $100 and a sprinkling of Exportas, a few separations otherwise, Very Fine (no photo). Estimate  $100 - 200. $0