Hello Russel,
Looks like a good 19th century rencong.
I'm pretty sure that the break is old and got glued already.
Quote:
As I would like the repair to be functional as well as aesthetic, perhaps I should incorporate a retaining pin of some kind to add strength
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With the rather thin hilt part, this repair is not easy to do but you'll need a (metal) pin, indeed, and work very carefully.
However, before you start with the repair work, make sure to remove all old glue! The probably best way would be to have both surfaces touching a damp towel for several hours (possibly up to days) until the glue softens and gets whitish, then carefully clean off all glue with needles and forceps; afterwards let the horn dry slowly and let all pieces equilibrate for several days in a well-ventilated place with as little fluctuating humidity as possible.
Regards,
Kai