Thx AlamShah for the pm. You see, there are a lot of blades like that (especially the wavy one) that look obviously...well, mass produced. They could be made in Madura, Jogja, even Kelantan for that matter, but the fact remains that these kinds of blades are not worth restoring.
By seeing the pictures only, It immediately reminds me of those blades that I bought when I was a real novice collector. After I discovered this forum, kampungnet, and of course Malay Art Gallery, couple with a few books that I bought along the way, then I realized that I was taken for a ride...
I sold all those kerises (actually I got 3 of them) to a (collector)friend who didnt mind collecting lower end kerises - I sold them with huge losses off course