1936 Pilot George Chavez 35c brown & 1937 25c magenta (C22, 25), Waterlow proofs in imperf margin blocks of four, each stamp with security puncture of 4mm (1936) or 6mm (1937), 1937 block some light marginal bends and 5mm closed tear in selvage only, fresh and rare blocks, NH, F-VF. Powered by SixBit's eCommerce Solution. The item "Peru 1936-7 Pilot Chavez 25c, 35c Waterlow imperf proof blocks-1" is in sale since Thursday, April 01, 2010.This item is in the category "Stamps\Latin America\Peru". The seller is "george_alevizos" and is located in Topanga, California. This item can be shipped worldwide.