Most of the letters have a numeric equivalent just like in wikipedia.
Most of the weight in other countries use a grain weath or barley to have a measure.
In tagalog maybe butil.
Maybe corn or maize or palay piloncitos could be an equivalent of a measure or denomination a lenth.
Pilonsitos as a mas 2.65 grams massa,mass,measure,mene.
A lenght of several beads ofg piloncitos equivalent to a measure with letter.
M as the highiest denomination in gold and in weight in piloncitos.
now the other letter let the expert who have piloncito weigh them what is the first and first letter.
Maybe barya also barangay smallest unit.
It was made for more standard of trade,standard metal gold,standard measure.
No silver and copper?
Other coin in ancient times they stamp to sign it as a good gold.
Piloncitos with letter it must be good gold wagas with letters.
M also represent water most of M have wavy lines in baybayin it is with circle and two poke just like a head of a ox which represent A or head.
Most of the coin in ancient times was symbolised by head like the coins of lydia with a lion or other animal abudant in thier area.
Some coin also represent wealth like ass or donkey,horse bull,ox common animal used for thier living and trade, sometimes also as a unit of measurement and denomination.
In the past they use scale that can weigh a bull or a cow.
Maybe water bufallo,Letter m as a measure and water buffalo is abudant in the area used for farming.
Its a currency with a measure base on animal repersent with a letter.