They can be made from solid wood of cabinet grade quality, (Walnut, Cherry) or softwood construction with hardwood veneers. There is no particular wood connected with the manufacture of Grandfather Clock cases, except that the clockmaker will want to use the highest quality wood he can get for the best clocks. Mass market grandfather clocks today (those in the $800 price range) are made of medium density particle board with real wood veneers.
shail shah made bauhaus clocks
The first mantel clocks were made in the 1750's. They were first made in France. Mantel clocks are smaller clocks usually placed on a shelf or a mantel.
Plastic alarm clocks are made of plastic.
digital alarm clocks have copper but analog clocks depend on who made it
By different parts of tools
Yes they have made clocks with gold moving parts.
The original answer here was nonsense, pianos aren't only made of timber, most grand pianos are made of timber because it's a strong, and solid wood.
people wanted them made, so they made them
No, trees for timber are cultivated resources.
Yes, there are clocks that have been made as replicas of antique clocks.
Germany
Ctesibus was a Greek inventor who made water clocks with moving figures on them.