A praxis known from a papyrus (PGM LXI 1-38) specifies that love charms had to be incised with the image of Horus on a lotus flower and the magical name Abraxas. Pieces with the Horus-scheme used as love charms: CBd-533, CBd-534, CBd-1386.
Bibliography
Bonner 1951 on CBd-520
Michel, BM on CBd-520
The British Museum Collection database on CBd-520