Antique Furniture Direct has dated this piece to the 1750s.
With green painted interior and 3 shaped shelves it has a working lock and key. Dating from circa 1780.

Construction/Wood
Mahogany
Condition Report
Good condition. Good patina. General marks and wear commensurate with age.
Dimensions
Width Across Door: 23 inches
Width Across Sides: 5.5 inches
Depth Middle Front of Door to Back Corner: 21 inches
Depth Edge of Front to Back Corner: 21.5 inches
Height to top of pediment: 51 inches
Antique Furniture Direct has dated this piece to the 1750s.
You can view the stock and full dealer information on the Antique Furniture Direct Profile Page