1933 SEPTEMBER 1: MANILA to NORTH DAKOTA
Bureau of Education official mail with 26c and 2c Rizal O.B. issues for 28c rate, shortpaid by 2c the proper Quintuple (30c) First Class Rate to the U.S., 150 grams maximum weight.

26c O.B. Extremely Scarce on Cover
1933 DECEMBER 27: MANILA to MICHIGAN
Governor-General offficial mail with 26c Carriedo O.B. for proper Single Outbound Registered Rate to the U.S. (6c Postage + 20c Registry Fee).

Extremely Scarce Proper Solo Use of 26c O.B.
Specifically Issued to Pre-Pay Single Outbound Registered Rate to the U.S.