School House Antiques has dated this piece to the 1920s.

Clock case stamped “ATO”, a pseudonym used by Leon Hatot.
The clock case is in good, original condition with minor signs of age and use as to be expected.The clock movement has been replaced for a Quartz movement. In working condition.
Dimensions:
High: 31.5 cm
Length: 35 cm
Depth: 11.5 cm
UK Delivery 15 GBP
School House Antiques has dated this piece to the 1920s.
You can view the stock and full dealer information on the School House Antiques Profile Page