TYPE IV-1
TYPE IV-2
TYPE IV-3
TYPE IV-4
TYPE IV-5
TYPE IV-1: Handstamped in violet stamp pad ink. No dot or period after “O” and “B”.
With Long Serif on "B". Size: 5.0 x 4.0 mm

Local Type marking used by the Philippine Constabulary only in January 1906,  in the province of Tarlac, originating from the office of R.A. Preston, Senior Inspector.

ISSUE
REFERENCE #
REMARKS
1c Franklin  ST4.1-V-226  Exist on two covers only
TYPE IV-2: Handstamped in black or violet stamp pad ink. No dot or period after “O” and “B”. Wide spacing between letters and "B" a fraction lower than "A". Size: 6.0 x 2.9 - 3.0 mm 

Used by the Philippine Constabulary from January 14 to mid August 1906. Predominantly used in the Bulacan towns of Baliwag and Malolos and in the provinces of  Nueva Ecija, Pampanga, Pangasinan
and  Tarlac.

ISSUE
REFERENCE #
REMARKS
3c Jackson ST4.2-V-215 a
1c Franklin ST4.2-V-226 a
2c Washington ST4.2-V-227 a
a ST4.2-BK-227 a
5c Lincoln ST4.2-V-230 a
10c Webster  ST4.2-V-233 a
50c Jefferson ST4.2-V-236 a
2c Washington ST4.2-V-240 a
a ST4.2-V-240a Booklet single
TYPE IV-3: Handstamped in Black printer’s ink With period after “O” and “B”. Serif on “B”
Size: 10.0 x 3.5 mm.

Used by the Philippine Constabulary only in September 1906,  at Malolos, Bulacan on official correspondence from the office of H.B. Orwiz, Senior Inspector.

ISSUE
REFERENCE #
REMARKS
1c Franklin  ST4.3-BK-226 Exist on 2 covers only
TYPE IV-4: Handstamped in violet stamp pad ink. Without dot or period after “O” and “B”. Wide spacing between "O" and "B". Very short serif on "B".  Size: 5.25 x 3.0 mm

Used from January 15 to mid June 1906 in the towns of Baliwag and Malolos, Bulacan province and in the towns of Arayat and San Fernando, Pampanga province.

ISSUE
REFERENCE #
REMARKS
1c Franklin  ST4.4-V-226 a
2c Washington ST4.4-V.227 a
TYPE IV-5: Typed to the stamp in black and red. Comma after “O” and “B”. Wide psacing between “O” and “B”. With serif on "B".

Used only in Balanga, Bataan Province on official mail from the office of John Green, Senior Inspector.

ISSUE
REFERENCE #
REMARKS
3c Jackson ST4.5-BK-215 On cover
1c Franklin ST4.5-R-226 On cover
LARGE O.B.
S-1
S-2
S-3
S-4
S-5
S-6
S-7
S-8
S-9
S-10
S-11
S-12
SMALL O.B.
L-1
L-2
L-3
L-4
L-5
L-6
OFFICIAL BUSINESS
OFFICIAL MAIL
1907 EXPERIMENTAL