1736-1795 One Cash ?

Hi, I am questioning whether this is a 1736-1795 or is a fake. It looks very nice to be as old as it is suggested to be. Any help would be great. Thanks in advance

Hello,
https://en.numista.com/catalogue/pieces1133.html

Front looks fine to me; the Manchu characters on the back look too thin and straight though.

Posthumous issue of Qianlong for this one : I'm looking for this kind of coin
Type H1, Eastern branch privy mark, so reference DH #22.231 (minted between 1796-1798).

For me this cash is guenuine.

Verweis : "Cycnos"​Posthumous issue of Qianlong for this one : I'm looking for this kind of coin
​Type H1, Eastern branch privy mark, so reference DH #22.231 (minted between 1796-1798).
​
​For me this cash is guenuine.

You are right! and this is a special type called 山底隆(long with a 山 bottom, as usually it should be a 生). Not posthumous issue actually. Qian Long retired at 1795 and died at 1799. As mentioned above, the Manchu script looks a little bit weird tho.