This is probably one of the biggest surprise when I saw this on offer. I have seen pictures of this before and probably have only only seen less than 10 - 20 of this online.
Hua Hsing was a bank that was formed under a reformed Government of the Republic of China in Shanghai under the Japanese occupation. Issued only in 1940 and demonetized in 1941, the most common is the 10 fen.

4 different denominations are planned - 1, 5, 10 and 20 fen. 10 fen is the most common and 1 fen is also supposedly a circulation coin. Most of these coins I believe were melted down due to the ongoing WWII at that time.
Hunting one of this 1 fen down is absurdly hard. The other two (5 and 20 fen) are literally impossible to find - I don't believe that they were ever released in circulation.
This is the supposedly circulated 1 fen

Even with the environmental damage, this is quite scarce in any condition. In fact this is a lot better than I expected, perhaps aUNC details. Stacks has sold just 6 examples - that shows how scarce this is. I did not expect own one of this to be honest!
https://archive.stacksbowers.com/?q...602663945404 Would like to know more information about this