Intresting dagger probably from Bugis or Makasarese origin. The blade shows signs of inscriptions as can be seen on the pictures below. The shape of a boat (see below) can be recognized along with some script. The signs have strong similarity with the old bugis script (just google: bugis & alphabet for more info). Bugis used scorpion toxics to give their blade a lethal effect, this might be a reason for the inscription.
For more pictures and info (Its on eBay)
http://cgi.ebay.com/Old-Bugis-Badik-...QQcmdZViewItem