It is a Chinese "saddle" sycee.
Most sycee in this "saddle" shape came from Yunnan Province.
There are three sets of inscriptions but they are all the same.
The inscription is written in two vertical columns. The Chinese chararcters are read top to bottom.
The inscription in the right column reads tong chang gong ji
which is the name of the company. This translates as "Tong Chang Gong Bank".
The inscription in the left column reads zu se yan ke
which translates as "pure salt tax silver".
This sycee was meant to be used to pay the salt tax or salt duty.
I tried doing a quick search to see if I could find another specimen exactly the same as the OP's sycee.
I did find a sycee from the same "Tong Chang Gong Bank". If you look at this Chinese webpage
, you will see that the right column inscription on the sycee is tong chang gong ji
, the same as the right column inscription on the OP's sycee.
The inscription in the left column, however, is different. It reads hui hao wen yin
which translates as "remittance bank fine silver".
I also found this sycee
which has the same left column inscription ("pure salt tax silver") as the OP's specimen. However, this sycess is from a different company.
I have no experience and am unable to determine if the OP's specimen is authentic or not.
As we are all aware, there are many fake sycees and the good ones are also made of silver with the correct weight and purity.
(I hope the above explanation is clear even though I have not included the Chinese characters. This forum's software, unfortunately, does not display Chinese characters.)