Any comments ?

[Conogre]

I'll chime in on agreement with Aceh being a leading contender although brass bucklers, from what I've been able to determine, were widespread and valued throughout the Philippine and Malay archipelagos....how many different tribes actually made them I don't know, but I've seen them attributed to well over a dozen different tribes and regions, with some "spun", some sand cast and others made through the lost wax method yet all surprisingly similar in size and appearance even into Persia, India and SE Asia.
Normally there would be a cusion or pillow, often leather on battle pieces, with the back sometimes covered in fabric glued on with an animal/dairy glue and two straps, usually leather or chain, running from the rings for a secure grip.
It's hard to tell if the repair was from a manufacturing flaw or if it was repaired battle damage, such as a sword or axe cut, possibly even a bullet hole.
SWEET aquisition.
Mike
ps....I've even seen similar attributed to Benin in Africa, although this one looks very much like Acehan or nearby.