Late 20thC Chinese large vase Qianlong style.

The glaze colours are too bright and rich for an 18thC piece, and instead point to a post-1880s date, when ‘modern’ dyes were discovered and added to glazes and enamels.  Plus the foot rim is black pointing to a different firing method to that used in the 18thC (white or orange foot rims would be expected in that date). The Chinese continue to use old dynasty marks to this day, so they cannot be solely used to date a piece (although the authorities are finally clamping down on the practice). And the mark has been copied incorrectly. (True mark below)
All in all I think it’s a post 1960s piece, but that’s just my opinion.