I have owned this cool clock for a while. It isn't super old, maybe 15 years.
Measures 19 in. X 13.5 in.
Depth of the shelf on top is 2 5/8 inches
Please note that any apparent wear is intentional for the look of the clock. The artist designed it this way.

Also, over time, the movement (the part where the batteries go) wears out and may need to be replaced. This one was fine last I checked, but be prepared to buy a new one. They go for maybe $10 at Michael's.