Oil lamp with image face in top relief (1st to 3rd century)

Small oil lamp with 3 spouts. Top a face embossed. Is in a very nice undamaged condition. No repairs.
(ancient Roman top, 1st to 13th century)
The dimensions approximately:

Length: 11 cm
Width: 7 cm
Depth: 5 cm
Weight: 135 grams (0.135 kg)