Chinese coin - D

This is the second of 4 unidentified Chinese coins that my father brought back from China, where he was stationed by the US Army in WWII. Diameter around 24.5 mm, weight 2 grams (from a postal scale, which measures no fractional grams). Can anyone identify it? A pointer to a catalog entry would be most welcome.
Thanks.
Bob

obv : Chien-lung T'ung-pao
https://en.wikipedia.org/wiki/Qianlong_Emperor
rev : Boo-j'i, mint : Hu-Pu board of revenu?
1736-1795
https://en.numista.com/catalogue/index.php?mode=simplifie&p=1&l=chine_empire&r=1736&e=chine_empire&d=&ca=3&no=&i=&v=&m=&a=&t=&dg=&w=&u=&f=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y

Hello,

Qianlong is correct, but mintmark looks much more like a common Boo-chiowan to me:
https://en.numista.com/catalogue/pieces1133.html

Verweis : "CassTaylor"​Hello,
​
​Qianlong is correct, but mintmark looks much more like a common Boo-chiowan to me:
​https://en.numista.com/catalogue/pieces1133.html
​
​

​Yes it is possible.
The picture is not very clear