Old Chinese Coin

It's a Chinese cash coin from the last dynasty.

Let me look up the details (your top image is a little small, need to enlarge it bigger for me to read).

Bottom picture is the obverse and needs to be rotated 90 degrees clockwise, it reads

Ch'ien-lung T'ung-pao (ie top, down, right, left), cash coins with that obverse where minted by emperor Kao Tsung (1736-1798)

The bottom picture (which has to be rotated 90 degrees clockwise as well) indicates the mint, yours is

Boo Yumwan, ie the Board of Public Works mint in Beijing.

While I on principle abstain from giving any specific value estimate, those coins are quite common and not valuable.