Vintage wartime or prewar "Andenken" souvenir pin. It looks to be made from bone or horn. The material is different thicknesses throughout. Some of the ends are a little delicate.
Andenken? Denk an what? I guess you are just intended to assign a purpose to this pin when you purchase it. Perhaps you will remember War's End Shop every time you accessorize, but I don't expect that; you can do better.
