Where does this mark come from and how old is it?

[Kroon81]

Hi,

I'm about to go visit a collector in a few days that's willing to sell me some of his collection. Now I don't want to look very stupid and embarass myself, or him. He sent me a picture of a pumpkin jar that he wants to sell. Could you help me with the identification of the mark and its age? Thank you.

[Adriano]

This mark is reported in the Gotheborg.com site as a Chinese mark of 1980-90 period.
gotheborg.com/marks/20thcenturychina.shtml#qianlongyuzhi

Best regards.