I found some keris that has the same characteristics come from the islands like Selayar and Makassar. To determine the authenticity of the keris from Sulawesi that you can pay attention to the material that is in use, and in my opinion that your keris comes from water areas such as Makassar and Selayar or include original keris Bugis.
You can pay attention to all three of these characteristics, the chain model mendak, handles and timpo are the same. And a handle shaped dowels (Takala) are mostly found in areas near the coast such as Sumbawa, Makassar and Selayar :
