To collect these would cost someone a great amount of money in the case you would like to collect antique ones!
I've seen these en masse in antique shops on Bali 15 until 20 years ago in all qualities. Yours is a better quality one but vintage to recent, they still work them until today for collectors and tourists.
I've taken a picture from the book in the sec. pic, a good book about the Batak.
Regards,
Detlef
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