an old keris tok chu..but is it from the master?

[Green]

There are plenty of keris claimed to be tok chu or tok chu style around and one can easily commission to make copies of tok chu style blades of various sizes over here in Kelantan.

I just bought this keris which looks quite old to me with badly damaged portion on one side . The workmanship did not look too refined to my untrained eyes but do show tok chu characteristics. I'm wondering if this came from the old master himself or just a copy made around his time? the handle is a mix and match and did not come with the blade.