[Ian]

It is interesting to look back in the Archives at some of the precursors of the 'Dutch klewang." Amuk posted these examples, some of which resemble what we are discussing here. This is Figure 9 of his post here:
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And here's examples of the development of the Maréchaussée sabel, showing early precursors (A,B) with altered versions of the Dutch 1875 cavalry hilt.
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It appears that several examples shown above, including the OP, may have been early precursors of what was later developed into the Maréchausséee sabel or "Dutch klewang." Some of these precursor resemble Sumatran klewang, and it is documented that the "Dutch klewang" was introduced to address the ongoing unrest in Aceh and to provide troops with a sword that competed favorably with local swords. These precursor swords were developed in the 1880 and 1890s, before the arrival of the military "Dutch klewang." Some were made in Sumatra and possibly some in Java. There is a discussion of these developments in Puype, JP & de Stürler Boekwijt, RJ. Klewang. Catalogus van het Legermuseum (Catalogue of the Dutch Army Museum). KNIL, Landmacht, Zeemacht, Marechaussee en Politie. Royal Netherlands Army and Arms Museum: Delft, 2001, pp 344.