Southern Song Dynasty Guan ware Celadon Vase with Plate-like Mouth

A celadon porcelain bottle made in a officeial kiln during the Southern Song dynasty.
It has a plate-shaped mouth like a board, a long and narrow neck, gently angular shoulders, and a slightly bulging cylindrical body.
The bottom is thin like a Guan ware, and the inside of the foot is a little deep, so there are five nail marks.
It is rare for official kilns to leave nail marks, and this is a remnant of firing techniques from before the Southern Sung official kiln.
The glaze is applied to the entire body, including the inside of the bottle, on black clay that contains a lot of iron, which is typical of Guan ware.
You can check the thickness by looking at the broken glaze at the base of the neck.
The thick glassy glaze leaves a large crackle-glazed throughout.
It is a representative form of Chinese ceramics and has a strong presence as celadon.

There is no conspicuous flaws.It has good luster throughout and is in good condition.