Technically this should not be referred to as a tumbok lada. Tumbok lada refers to a related type of weapon from Northern Sumatra with an oversized hilt (ref. van Zonneveld, p. 149) and slightly broader blade.
A slightly more appropriate term would be sewar, although even this would be technically incorrect as the proper sewar blade has a downward curve. Being a contemporary piece though such inconsistencies are to be expected though.
