Hi Robert,
Am not an expert on these blades, nor on any other blade for that matter!
But once again in the
Macau exhibit, they had there two bolos (pics below) that are very similar to the one you have.
And their descriptions are as follows:
210. Luzon Tabak
Period : Post 1900, Katipunan Era.
Hilt : Carved fluted carabao horn hilt with brass wire inlaid in flutes.
Blade : Chisel ground blade with a forward down and upsweep shaped blade.
Scabbard : Tooled leather scabbard with leather throat.
Origin : Southern Luzon, possibly Batangas.
Overall Length : 51.5 cm [20.3"]
Blade Length : 35.5 cm [14.0"]
Handle Length : 16 cm [6.3"]
Scabbard Length : 37.8 cm [14.9"]
211. Luzon Tabak
Period : Post 1900, Katipunan Era.
Hilt : Detailed and intricately carved carabao horn hilt in the shape of a horse head detailed silver reigns and eye cover. Round silver ferrule. Intricately carved floral motif Peened tang.
Blade : Chisel ground blade with the clipped tip. Blade is inlaid with silver in floral motif.
Scabbard : Tooled leather scabbard with leather throat.
Origin : Northern Luzon
Overall Length : 49.2 cm [19.4"]
Blade Length : 33.2 cm [13.1"]
Handle Length : 16 cm [6.3"]
Scabbard Length : 32.5 cm [12.8"]