Antique Celluloid Cigarette or Cigarello Filter. Art Deco Era I believe. Smells minty like celluloid in warm water. Tested for Gold and it is gold filled at the opening. This is 4 3/4 in length and 1/2 inch at widest. Oblong opening I think is for a cigarillo? Good and sturdy condition. Shows wear around the opening and mouth piece. Interior has tobacco staining and some clouding from patina. Please message me if you have any questions or need additional pictures. Thanks for looking!