Cylinder Seal with Gryphon

2nd millennium BC. A black jasper cylinder seal with winged regardant gryphon, two figures crouching with T-shaped object (bow-drill?) between; accompanied by a museum-quality impression. 4.46 grams, 27.16mm (1"). From the private collection of a North West London lady; previously with a central London gallery; formerly acquired before 1990.
Condition Report: Fine condition.