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 375 Barstool. Aisuu Side Chair. Foster 500 Sofa. Jaan 781 Sofa. Leadchair Executive Soft. Exec-V Desk.