This is a wonderful little vintage Art Deco compact in silver colored metal made by the Pompeian Company. It is their only square compact and it was made in the early 1930s for the English market. It is marked Pompeian Beauty Powder Vanity on the back. It still retains its puff and the mirror is intact and clear.
Pompeian was a leading cosmetics maker in the late 1800s and early 1900s. They were known for their advertisements featuring 'Pompeian Beauties' including actress Mary Pickford.
It measures 2 inches square and it is in very nice vintage condition. It does show some wear and some small dark marks. These are more evident in the photos than they are in person.