Information on this marking

[BarrettBlues]

Hello, completely new to this.

This has been in the shed for sometime now, always looked at it as a large plant pot, but maybe not. Only recently decided to look into it.

There are two small blue dots also engraved just out of shot.

[Stan]

This is a stamped mark on unglazed porcelain, I can't tell from the photo if this is the bottom that the mark is on, if it us it is generally known to be later in the 20th century.

[BarrettBlues]

Thank you Stan!
Any idea on what it says? I can read Hiragana and Katakana but we are obviously not dealing with that here, the only thing I have picked up on is the kanji on the top far right;
Da (great)
I see Qian, top left
Qing,bottom right
and Long, bottom left.   

[ssbill]

20th century Qianlong mark

[Stan]

I can see why you could not find this mark, it is written incorrectly, Qianlong marks were never written  like this and it doesn't matter anyway because most marks are spurious.

[BarrettBlues]

There are a few more picture of the piece here, I don't know if it helps much;

[Stan]

A picture of  the whole bottom would be nice, but from what I see it looks like 3rd quarter of the 20th century.

[peterp]

All lines/contours of the decoration visible show signs of printing.