When I look again to your sheath I understand why you have thought that it is a sheath from Sumatra/Palembang. The sheath look like the carver hasn't known how to look a sesrengentan sheath from Bali and have created a mixture from this both sheaths.
For better understanding I have attached pictures from your sheath beside from both sheath forms. The sesrengentan pictures are taken from the book "Keris Bali Bersejarah".
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