Bastet-Mut is a syncretization of both goddesses with Bastet wearing the Mut crown. This is an undescribed and rare amulet1

Bastet-Mut - Blue glaze with a partial dorsal pillar H 1.9, W 0.5, D 0.5
Bastet-Mut - Blue glaze with a partial dorsal pillar H 1.9, W 0.5, D 0.5
Bastet-Mut - Blue glaze with a partial dorsal pillar H 1.9, W 0.5, D 0.5

Blue glaze with a partial dorsal pillar H 1.9, W 0.5, D 0.5
Presumably Third Intermediate Period2 Private collection DA

References

1None, Unpublished amulet
2The exceptionally brilliant glaze points to the Third Intermediate Period, see Egyptian Art at Eton College, 1999, Eton College, Windsor and the Metropolitan Museum of Art, pp. 50-51