This question concerns the following coin:
https://en.numista.com/catalouge/pieces13195.html
KM has the silver fineness of this coin (KM# 20) as 0.900. Numista has it as 0.835.
KM has the 5, 10 and 20 centavos coins in this series all as 0.900 fineness (KM# 20, 21, and 22).
Numista has the 5 centavos and 20 centavos (pieces17451.html) both as 0.835 fineness, but also has the 10 centavos coin (pieces17450.html) at 0.900 fineness. Does anyone have a definitive reference that would allow us to determine which fineness is correct for these coins?
Interestingly, KM has similar small silver minors for the Philippines under Spanish rule at 0.835 fineness. It also has most of the small silver minors for Spain itself during this era at 0.835 fineness (large coins line the 5 pesetas are listed at 0.900 fineness).