清同治 青花「五氏宗祠」盃 《同治年介臣製》款

finely potted with deep rounded sides rising from a short foot to a flared rim, the exterior decorated with four hexafoil cartouches with ruyi-shaped lobes enclosing the characters wushi zongci, the interior centred with a shou medallion, the base inscribed with a six-character mark