This item is from the Showa era. It's uncertain whether "stone clock" is the correct term. It appears to run when the spring is wound. The long hand on the face has come off. I'm selling it without attempting repairs, as I don't want to risk further damage. I'm unsure of the material. Please understand that this item has been stored for a long time and shows signs of aging. The face is marked with "TOKYO CLOCK". Dimensions: Height 135mm, legs 1cm; Width 225cm, base 1cm each; Thickness 45mm, legs 1cm (front only). Weight: 2800g. I wiped the exterior with a damp cloth, but as it's a precision instrument, please understand that some areas may not be perfectly clean. Some dirt remains. I'm hoping someone will be interested. Display type...Analog