According to an Act dated July 19, 1849 Spain adopted the metric monetary system for herself and her colonies. 1862 had been designated as the year in which it should go into operation, but this was later postponed until 1864 for the Philippines, and 1866 for Spain. Hence, a new issue of stamps was made, of uniform type for Spain and her colonies, except as to the values given in the lower label of each stamp.
The stamps were typographed on tinted paper by the Fabrica Nacional de Moneda y Timbre, Madrid, Spain. They were engraved by Don Jose Perez Varela; issued imperforate; measure 18¾ x 22 mm; and printed in sheets of 100 stamps, (ten rows of ten each). The quantities issued are unknown, although the supply that arrived from Spain was considerably large as to meet the demand until the end of 1868, when the remaining stock was overprinted "Habilitado Por La Nacion".
The design shows the left profile of Queen Isabella II, enclosed in an oval frame of pearls, and an elaborate diadem in the outer frame. The word "CORREOS" appears in the top label, with a white dot before and after it.
Four values were issued which correspond to the previous values of 5-cuartos, 10-cuartos, 1-real and 2-reales respectively. A Royal Order of December 5, 1864 authorised the use of the 3-1/8 and 6-2/8 centimos values on foreign correspondence whenever their value permitted, despite being originally intended for "interior" use. (excerpts from nigelgooding.com)
3-1/8 centimos de peso fuerte. Issued in varying shades of black. Exists on buff paper (Scott #21; SG #26; Edifil #17) and cream paper (Edifil #17a).pictures shown above at right
6-2/8 centimos de peso fuerte. Issued in varying shades of green. Exists on white paper (Edifil #18) and rose paper (Scott #22; SG #27; Edifil #18a).not shown above
12-4/8 centimos de peso fuerte. Issued in varying shades of blue. Exists on salmon paper (Scott #23; Edifil #19), white paper (Edifil #19a) and flesh coloured paper (SG #28).pictures shown above at left
25 centimos de peso fuerte. Issued in varying shades of red. Exists on white paper (Scott #24; SG #30; Edifil #20) and rose paper (SG #29; Edifil #20a).pictures shown above at the center
Philippines Scott#21,23&24 with Plate Flaws, NO DOT UNDER "Po".
These are one of each kind plate flaws of Spanish dominion Philippines stamps.
Used. Very Rare.
Fellow collectors welcomed.