Thanks Robert.
Kai, the mandaya sword has one US occupation era 10 centavo silver Philippine coin dated 1904 on the reverse side . Another such coin was affixed (with glue?) to the other side but the date cannot be determined as it shows the obverse side (features a robed woman with a hammer hitting an anvil, smoking volcano on her left). I have tried etching the blade with vinegar but the laminations were wispy and scattered. It's great that you liked the pics.