Hello Dave,
I think that it is a later piece, maybe middle of the last century what would confirm the given date of collecting. The older panabas swords has a different way to attach the blade to the handle, unusual to see a ferrule but frankly said I know not enough about panabas to be sure. Also the brass dots look a little bit weird.

Will be interesting what the knowledge members will tell you about this panabas. Please post some pictures after you have given it some care and maybe have etched the blade.
Regards,
Detlef