unmounted mint Block Larger Than four ½c-25c 1926-31 Issues (637-642, 653, 692-698), mint sheets or half-sheets, complete sheets of 100 incl. nos. 637-640, 653, 693-694, 698, all others are half-sheets of 50 with plate no. blocks, never hinged, fine-very fine lot, Scott retail $5,600.00+