Foster 503 Sofa. is made by Brand Walter Knoll. Details and photos of Foster 503 Sofa. are displayed above. You can also check other products in Furnishings category. Brand Walter Knoll / Furnishings Furnishings products by Brand Walter Knoll Andoo Barstool. Ishino Récamiere. CEOO Desk. Foster 503 Sofa. Leadchair Executive Fabricius Sofa.