Michael Johnson Antiques has dated this piece to the 1920s.
Comes with fully functioning lock and key.

Made by makers John Peck & Son’s Nelson Square Southwark Manufacturers to H. M. Stationery Office. This particular example is a full size black Moroccan leather box for JWP.
Materials;
Black leather and brass
Age;
1920-30
Size;
Length; 46cm
Width; 30.5
Height; 16cm
Reference Number; 6880
Michael Johnson Antiques has dated this piece to the 1920s.
You can view the stock and full dealer information on the Michael Johnson Antiques Profile Page