Chinese coin - real or fake and what's the value?

It's from Han dynasty

How big is it?  There are several different versions of this coin.  But to answer your question, the calligraphy seems sloppy...

23.5mm

Here is mine for comparison.  The size varies based on the type of coin.  Can you also provide me with the weight.  At 23mm, it seems small for the large size.  Mine weights 9.26g at 35mm.

Imperial China, Qin Dynasty: Anonymous (300-200 BCE) AE Cash (Hartill-7.6)

Obv: 半两 Ban Liang
Rev: Plain and flat

I can't weight it right now because I don't have my scale with me because I'm travelling but when I get home I will weight it

2.6g