Web site: https://www.ancient-jewellery.com/
This is an excavated Roman signet ring, dating to the late 4th - early 5th century A.D. It is of a Henig type XV also known as a 'Brancaster' type. This example has a raised square-shaped bezel decorated with a bird. See also BH-715823 for type and further discussion. Also 'Brancaster type signet rings'
Sadly the hoop on this example has a crack, but is nonetheless intact and as excavated.
OBJECT: Signet Ring
DATE: c. 385 - 450 A.D.
RING SIZE: 9 1/2 (US) S 3/4 (UK)
SIZE: 23mm x 20mm x 3mm (bezel 7mm x 7mm x 3mm)
WEIGHT: 1.98 grams
PROVENANCE: Ex. European Private Collection.