Two antique abacuses

This is an old abacus.
I believe it's at the antique level.

My grandparents used this for their business back then.

I think it's a very rare item, so it could be used for display purposes.

Please make your judgment based on the images.
I believe it's a valuable item now. I think there's demand for uses other than just using it, so please consider it.

It's been stored at home, so please refrain from purchasing if you are overly concerned about condition.
Please feel free to comment if you have any questions.
*Please note that I lack expert knowledge, so I may not be able to answer detailed questions.