I think your problem HAX is that there is unlikely to be a Malacca coin specialist on this site? There may be someone with a general interest in coins of the whole region? Maybe scott knows something. He has worldwide interests.  The design looks like 1 keping Singapore merchants'  tokens from the early 1830's, these were struck in copper at the SOHO mint in Birmingham, normally about 21mm diameter, about 1.5 to 1.7 gm A trial on a 26mm lead blank is reported, as  are normal sized proofs in copper and brass Can you upload a better picture please,?  hard to make out the date,  What size and weight is it, and is it copper? David