Hello Ausjulius,
Sadly I haven't had such a klewang in hand but an other member, Willem has shown such an item long ago but I direct remember when you post your query, see here:
http://www.vikingsword.com/vb/showth...ghlight=guinea
There are written also a few informations. It seems that in the Gelvinckbay area from 1900 onward metal forging wasn't unknown. And since there was a lot of trade with other Malay islands it would be surprising when not also blades get traded.
Regards,
Detlef