Hello Henri,
	Quote:
	
	
		| The blade shows Javanese influence but probably South Sumatran ( Palembang / Minang ? ) . | 
	
 Typical Minang style; pamor is above average. I'm confident that the blade is at least 19th c.; some may suggest 18th c., I guess.
	Quote:
	
	
		| The hilt is damaged .The carving on the arm of the pekaka is more Palembang style than Minang . | 
	
 This Jawa Deman hilt is Minang. Genuine, antique ensemble - nice!
I agree that the buntut seems to be a later replacement - you could try to obtain a typical flared one if you prefer. The rattan bands also look like later additions.
Regards,
Kai