Rare latex rubber collect cup of porcelain, approx. 1940 from Firestone

Rare latex rubber collect cup of porcelain, approx. 1940 from Firestone Plantation, Liberia. H. 8.5 cm. Dia: 12 cm On the side the text Firestone D - 7 (area). The Firestone Plantation in Harbel, Liberia, is the world's largest contiguous rubber plantation, established in 1926. Owned by Bridgestone, USA. Provenance: The Director.