Id of east asian coin

Hello, 

I found this coin in east asia and I don’t find a correspondance in the caralog. Could you help me?

it’s diameter is ~20mm

It's from the Empire of China, emperor Qianlong.

Mintmark at the backside is hard to see.

Probably it is N#19755 

Ok, but the diameter beraly reach 20mm which is far from the 24 referenced…

You're right, diameter is a way too small and I can see a degenerated "Boo" on reverse.

So your coin is an “evocation” (not really a copy).

With “evocation”, do you mean a feng shui token like the other chinese cash you commented here today?

Yes