cover 1900-01, Official Mail, two legal sized covers, one with War Dept./Official Business cc & violet Apr 6 1900 Mil. Sta. Dagupan/Phil. Isles. duplex cancel (Goodale A-1) to Manila, reduced at L., other with Dept. of Posts cc & Apr 27 1901 Bacolod/P.I. duplex cancel, earliest recorded usage of a duplex cancel in the Philippines and without the words 'Mil. P. Sta.', also incl. one front of regist cover with War Dept. cc franked by no. 217 to NY and 1901 Navy Dept. penalty cover to Cavite, generally fine-very fine