Chinese tally 20th?

Hey everyone!

I found this interesting object which seems to have similarities with chinese tallies. I had no luck translating the symbols - google isn't very reliable on this. There is no stamp. 

I am grateful for any ideas!

Thank you,

Severin 

Quite a challenge !

Even character by character, the path does not lead far 😵‍💫

looks like Chinese calligraphy paper weight, Chinese character are in seal scrip.  bottom shows year and date, top part doesn't make any sense. Modern piece, probably made during 80 & 90s. Usually sold in pairs. 

https://en.wikipedia.org/wiki/Seal_script

Dear Jane,

thank you very much for answering! If you are able to read the year and date on the piece, could you tell me? 

Thanks again,

Severin

top to bottom  

长宋铜元第廿元延一年八月十八日造

“廿” is simplified Chinese character for “20”, which doesn't exist prier to 1950s