1.0 mm thick letters. Wide spacing between “O” and B”.
“B” with long serif. No dot or period after “O” and “B”

Local marking used by the Philippine Constabulary only in Iloilo province.

Handstamped in Black or Blue printer's ink.
Square instead of dot or period after “O” and “B”.

Used by the Philippine Constabulary in Manila and in the provinces
of Laguna, Negros Occidental, Pangasinan, Sorsogon and Tayabas.

ERU: January 12, 1906 in Manila