1940 - 1941 Bureau of Education Official Mail

1940 JUNE 5: MANILA to MALOLOS, BULACAN
27.0 x 18.0 cm Large envelope with pair of  1935 8c Pearl Fishing O.B. (#O18)
for 16c First Class Domestic Rate, 160 grams maximum weight.

SCARCE USE OF 8c O.B. ISSUE

1941 MAY 4: MANILA to MALOLOS, BULACAN
27.0 x 18.0 cm Large envelope with block of 4  of 1938 10c Fort Santiago O.B. (#OB31)
for 40c First Class Domestic Rate, 400 grams maximum weight.

SCARCE 10c O.B. BLOCK OF 4 ON COVER