Below is one of the examples I have found with a bubri motif I think resembles the motif on my own example (on the lateral surfaces of the pommel as circled above). It is the pommel of a pesh kabz that sold earlier this year at Sotheby's. Dated to ca. 1790, it is described as having a bubri motif with a possible Seringapatam attribution.
Also, one of the questions I have had is whether the styling of the makara may serve as a clue to the origin of the sword, given the variety of stylistic differences that seem to appear in the form. I also find it interesting that the styling of the makara (on the chape) appears to bare some resemblance to my example with regards to the pronounced nasal ridge and the ribbing...
Photos below...
Bubri motif:
Makara chape:
Dagger:
Spine with recurring bubri:
Link to lot:
Mysore Pesh Kabz
ETA to add a photo showing the two motifs side-by-side: