I'm pretty sure that someone at sometime or another has hidden some gold or gold coins inside of a clock for safe keeping. A neat place to hide gold in a clock would be to make the pendulum weights out of it.
Some watches, especially pocket watches, have gold in them. Their cases and/or chains are made of gold.
And it’s a pretty good bet that in the past 400 years there have been a few clocks with solid gold cases that were made for say a Russian Czar, a member of the Rothschild family, a Maharajas of India, etc.
Geeezee, even now days one reads about someone that has "solid gold bathroom fixtures".