Originally Posted by josh stout
The top one I posted is from an area of Northern Sumatra where Chinese laborers were brought by the British in the late 19th c. The set of two and the other one with a wooden handle are all Chinese. All three are octagonal. The set with brass guards and pommel has a scoring line accentuating the rounded points. The other wooden handled Chinese example has a flat tip. The Sumatran one looks exactly like the other Indonesian examples shown.
Josh, thanks for adding your sai here, I put it next to some other sai from the same area to compare. I think this is the most images of sai from the Indonesian area ever in place. Unfortunately I do not know of any sai that is known to have come from Okinawa. Your Chinese sai are quite nice, the vast majority of achinese sai seem to be four sided.