As Fernando has well observed in post #28, this example being discussed is clearly not a plug bayonet as the swell in the grip is opposed to the shape required for insertion into a gun barrel.
However, the plug bayonet, much as many weapon forms and features, remained in use traditionally much longer than many realize with Spaniards.
There were examples vestigially made in the plug bayonet form even into the 19th c. which continued to serve as a hunting knife, and the designs often would lean toward the features of other examples of knives in use at the time.
I think observers here have compellingly shown the example in discussion as probably of Philippine origin, and that features such as the concave rebates at the base of the blade are a feature seen in other examples of these types found in Philippine context.
The Spanish influences in arms and even armor in many cases (Moro examples) is well established in the Philippine archipelago with their colonial presence there until the end of the 19th c. as Mark has pointed out in #9.
The features of some Albacete knives no doubt crept into designs along with of course other Spanish and perhaps Asian features in the producing of these knives/dirks.
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