Pioneer Era (pre-1898)
The postcard of this era is characterized by an undivided back. Written messages were restricted to the front side (as seen in the postcard below), with the entire back dedicated to the name of the addressee and the address only. A local view in black and white photograph covers the whole front or face of the postcard. Also during this period, only the government was allowed to use the word "POSTCARD" in the back of the postcard. When Congress passed the Private Mailing Card Act on May 19, 1898, private publishers and printers were allowed to produce postcards.
There are no examples of Philippine postcard belonging to the "Pioneer Era".
Postcard Wikipedia Entry