I tend to agree. Are there any circular marks where the inner workings would have rubbed? Or maybe a small divit in the middle where they would have pivoted? -not that I know exactly how the old ones work.
Think sleep time guys.? The design looks like a man in a night cap surrounded by stars.? There's a theme there.? Maybe the sand-man. Don't have any idea of what it is though.? Good luck~CO2