Spatha shell

 Spatha shell.
From Naqada tomb 1539, Egypt.
Naqada I period.
The Petrie Museum of Egyptian Archaeology, London. With thanks to the Petrie Museum of Egyptian Archaeology, UCL.
public domain

 https://fr.wikipedia.org/wiki/Fichier:Spatha_shell._From_Naqada_tomb_1539,_Egypt._Naqada_I_period._The_Petrie_Museum_of_Egyptian_Archaeology,_London.jpg?fbclid=IwAR0T7LVvWiKUtNMMgJA8BnYagX2zRb2PffQS-arfSfIZNIMrvMUGEsB3sUA