Clearly a statue of the Buddha, standing instead of the typical seated version one usually thinks of.
It's metal - judging from the discoloratio, bronze. It could be from anywhere, but my guess is this is really old, so probably close to the roots of the religion.
This is the low-spoiler guide for "Statuette" puzzle in Chinatown Detective Agency. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.