A nice Sewar, also called 'Siwar'. The term Tumbok Lada is known for a look-a-like of the Sewar,but with different thicker hilt and more straight blade. the Sewar ha a more curved blade and slimmer hilt and scabbard mouth. Many collectors mix these names up. They both come from Sumatra
Here a typical Tumbok lada (Oriental-Arms)
Here the Sewar or Siwar (my own)
https://antiquesbythesea.nl/wp-conte...-1536x1028.jpg
See the much more curved blade of the Sewar compared to the Tumbok Lada.
Best regards,
Peter