Hello Nik,
Looks like a genuine pandai seras blade to me, too. There seems to have been quite a bit of erosion, especially visible at the base of the blade. Possibly some minor reshaping attempts at the elephant's mouth; I'm inclined to believe that the quality of the blade was a bit subpar to begin with though.
The tajong hilt also looks genuine to me (certainly not one of the cheap Indo copies but I heard that the carvers are getting better). Sharper close-ups from several angles would help to narrow age down.
Regardless of any possible issues: Unless you're a celebrated vocalist or song writer, you got a bargain here - congrats!
Regards,
Kai