Marble Chess Set - Antique Game

This is a chess set with a chess board made of stone, resembling marble.

The chessboard is heavy due to the stone material.
The chess pieces are metal, but the exact material is unknown.
This is an old set from my home, so the box containing the pieces is damaged, and the chessboard has minor scratches and stains.
Please assess the condition based on the photos and consider purchasing with your understanding.

The items included are all shown in the photos.
As a bonus, I will include the chess rulebook shown in photo 9, although it is from a different chess game.

＜Size / Chessboard (approx.)＞
20cm (length) x 20cm (width) x 1.5cm (thickness)

Please understand that this is a used item. No claims or returns are accepted.
(Please refrain from purchasing if you are overly concerned about condition)
Also, please consider purchasing only if you can communicate promptly within 24 hours.