Sandang walikat sheath from metal

[Green]

Hello/Salam

Here is my new purchase based on pictures (as usual) and although it is not yet in my hand and i can not make a better judgement, i would like to ask opinions from all of you regarding several points.

i bought this primarily because i do not have any specimen of sandang walikat waranka and i have been particularly looking for one that is made from metal preferably silver. This one , the seller (which most of you can easily identify I think) described it as made from 'white metal'. The handle is described as ivory, although from the pic I could not ascertain it as such. it could very well be from bone or deer horn? the carving is shallow and the motif is not familiar to me. So here are the questions:

1: can anyone suggest where this metal sandang walikat originated from? (my understanding is that this form is generally from madura/east java). What metal is it made of? what is 'white metal'?

2: are walikat wrankas made from metal common?... i don't see this very much. Who use this type of wrangka? and is it for any particular purpose?

3: I guess the hilt is from Sulawesi based on the rekko/patah tiga form. Is this kind of carvings recent or old style? is it ivory?

4: the blade is simple but robust looking spokal(sapukala) type. my guess is it is from sulawesi.is this origin reasonable?

thank you and waiting for your comments and clarification.

nik