[Bonetools] ivory(?) double bead dumbbell bead

[fiona beglane]

See the attached image.  I have this double bead which seems to be made of ivory.  It was found on a medieval and post medieval site in Ireland.  L=10.14mm, dia=5.55mm and is perforated.  I know that double beads have been found in early medieval sites in Ireland - usually made of glass.  Does anyone know of any other bone or ivory examples from Ireland or elsewhere?
Thank you all

Fiona
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