small blue porcelain vase (snake octagonal mark at bottom)

The item is 17 cm tall and is blue (print?) on porcelain or china. It has 2 small handles at the top and a floral pattern. At the bottom of the vase is a blue mark that is octagonal in shape.  The pattern is from left to right a staff, then 2 dots, then a snake followed by 2 joined dots over a box.

I would like some information on the vase like what century, approximate date, which country and worth?

Your help is much appreciated.

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