Hi Detlef, congratulations with this sword firstly!! To my opinion this sword is from North Luzon from Ilocano's, deriving from the shape of the handle (seen in neighbourhood of Vigan). This type would have been carried in a leather sheath by 'lowlander officers' (characterised by wearing a uniform and an oval high pithhelmet) but they were traded around. 'Katipunan' -if you didnt know already
- actually means the resistance against the Spanish and is mostly symbolised by a closed fist. I do estimate this sword from being 1850's so from that era, but therefore not specifically as a 'katipunan'example. (tagalog=lowlander=ilocano)
Though I could be (proven) off with my origin as due to trade and this is not my exact field of expertise. Anyone?
Greetings