In 1991-92, the PNAS produced two calendars that illustrated, in the form of a historical numismatic survey and catalogue, Philippine coinage from the earliest Pre-Historic period to just before World War II. 

The two calenders are reproduced with the kind permission of the PNAS. The folios"represents the first of a series on Philippine coins, some of which have never before been published, and whose numismatic rarity and condition -- for some, even their very existence -- is legend. Put together from various Philippine collections and friends of the hobby who have so graciously allowed the society to photograph and exhibit these numismatic rarities, these coins may never again be gathered together in one publication."

"For purposes of this catalogue, a form of numismatic shorthand will be used, whenever convenient, to identify coins shown in the accompanying photographs. To illustrate: "8R Mexico 1732F" should read: a coin of 8-real denomination; minted in Mexico; in the year 1732; F being the initial of the official mint assayer for the Spanish Crown. Photographs are enlarged for detail and are not necessarily to scale."

800 - 1521
Gold barter rings of assorted sizes and weights principally used as money, inter-spersed with cast gold pellets of graduated sizes and weights, with what appears to be the Malay character for "ma". 

These pellets, known as piloncitos, have been found widely within the islands as well as in some islands of the Indonesian group. 

The meaning of the inscription is not certain but these items are almost certainly the earliest form or prototype of Philippine coinage.