Blue glazed "Cong" shape vase with Qianlong mark

Square vase, "cong" shape, glazed porcelain in crackle blue color. The relief represents trigrams. The foot is circular and in the center is a mark in underglaze blue "大清乾隆年制" (Dà qīng qiánlóng nián zhì).

Size: 34.5 x 15.5 cm; Base diameter: 13.5 cm