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spiral border with open top ends

Decoration of the scarab base with spiral borders having top ends (Martin's base types 1aa, 1ab, 1ac, 1af, 1ag, 1ah, and examples of 1ai having loose top ends) does not occur on name scarabs prior to 14th-15th Dynasty

14th-15th Dyn.
Ilin-Tomich 2023b; Quirke 2004a, 185