Chinese coin identifications

I have four Chinese(?) coins that I need help identifying.

#1 - 24.8 mm / 4.16 g

#2 - 24.8 mm / 4.17 g

#3 - 24.8 mm / 4.07 g

#4 - 27.7 mm / 4.07 g

Welcome to Numista!

Chinese cash coins 1,2, and 4 are easily identified at the Calgary site for Ch'ing dynasty coins. 

1. Wen Tsung aka Hsien Feng, 1851-1861, mint Boo Yuwan (Board of Works)

2. Kao Tsung aka Ch'ien Lung, 1736-1795, mint Boo Su (Kiangsi)

4. Sheng Tsu aka K'ang Hsi, 1662-1722, mint Boo Yuwan (Board of Works)

(There are also newer names for all these rulers you can look up if desired.)

I'm not able to read coin 3 because of the wear and corrosion, but with the coin in hand and magnification you might be able to match it up at this site. Or perhaps another member with more experience with Chinese coins will recognize it despite its wear. 

Thanks.  The obverse of the third coin is the same as the second, though I am having trouble identifying the mint.  As for the second coin, the mint appears to be Boo Fu even though that is listed for this specific coin on the site you directed me to, though I based this assessment on the mint mark for other Boo Fu coins on this site.

Hello

Third one

N#28092

I think 22.296