It mutually good to be here too Rick.
The smoothness on the surface of your tombak may be seen as a common Balinese styled finnish, but I don't think the tombak is of Balinese in origin. Without handling the piece it's hard to tell, but the metals used looks more "compact" and "stronger" if I may say. Arranged in the "miring" technique with the pamor "adeg", stronger metals, and of course made with an experienced empu, the fusion of the layers are more "tighter" and "compact" which when finally finished traditionally with limestone, can result in a more smoother surface. Not usually done in Malaysian blades, but not uncommon on Sumatran pieces.
Also note of the temper mark from the darker shades on the top half of the blade (especially the edges) where it is submerge during temper quenching. Another feature pointing it more towards a Sumatran origin.
The presence of a wax coating for preservation may also make the surface smooth, but removing the wax layer will expose the courser surfaces.