27 JULY
1906: DAGUPAN, PANGASINAN to MANILA
2c Washington
with handstamped blue O.B. used to pay for the postage deficit
without penalty
of 2 ounces weight cover instead of the 1 ounce pre-paid with
1c x 2 Franklin
with red “OFFICIAL / BUSINESS” handstamp, both vertical reading downwards.
UNIQUE
COMBINATION OF THE TWO TYPES OF OFFICIAL HANDSTAMPS
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21 AUGUST
1906: MANILA CIRCULATING
Official mail
from the Bureau of Science. Double rated, 1 ounce weight,
with 2c carmine
1904 Washington, blue O.B. handstamp.
THE ONLY
RECORDED BUREAU OF SCIENCE COVER WITH BLUE BLOCK O.B.
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