I am sorry, yet also to me the inlays of the initial Pedang seem to be done at least after the WWII.
Maurice, you probably have seen the other indonesian items from the original auction. These items surely weren't collected before 60ties.
http://katalog.auktionshaus-wendl.co...at/h/119/a/76/
Especially the kerisses have touch of beeing made to catch a colector with some bigger money, yet not so good understanding of materia.
You also see, how many indonesian items are returned to the auction house.
For comparison some other stuff coming out of Lombok these days.