One thing I look for is the tang. If the tang goes through the end and is peened, then it is from Luzon.
Quality is also a general guide. Poor quality with simple carvings usually indicate to me post 1920s. Silver content also disappears as one progresses from the turn of the 20th century, though not all pieces have silver on them.
Then if it has a triangle or sun on it, it is Philippine Revolution with was from 1898-1903.
Just a few ideas to answer your question.
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