Hello Cedric,
Kai's already answered your question but I would like to add that your Parang Pedang is more like a transition between a PP and a Murut Sangkit.
See
http://www.vikingsword.com/vb/showthread.php?t=2149
I am especially thinking about the characteristic Sangkit and Pakayun brass ferrule and also the scabbard.
Except yours I have only seen one resembling transitional parang and that's in the collection of one of our mutual Scandinavian friends.
How old do you estimate the (Iban) Parang #3 is?
Michael
PS Here are 2 "classic" PPs as a comparision - sorry about the bad pictures.