A 'Robin's-Egg' Blue Lantern Vase Incised Seal Mark and Period of Qianlong

of cylindrical form, finely potted with slightly tapering sides rising from a short foot to a waisted neck and slightly everted rim, flanked by a pair of flat gu-vase-shaped mock handles below the rounded shoulders, the ovoid body covered on the exterior with an opaque turquoise-blue glaze of robin's-egg type suffused overall with finely mottled dark greyish-purple, the base incised with a six-character seal mark all beneath the glaze, the unglazed foot dressed in a brown wash

An old Japanese collection.

There are some pinholes and a small chip/flake to the handle top.
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