Need Your Help Again With A Postage Due Stamp

Hi all,

I would need to know with which series this postage due stamp goes. It shows a margin watermark with the letters NW (from commonwealth?) and possibly something else under.
The shape of the letters looks different from the ones on the first two series (crown-NSW stamps) so I suppose it goes with one of the Crown-A series. The stamp is perforated 11.5-12X11.

Thanks for your help,

Louis

After another look with fluid, I don't think there is anything under letter NW. Probably more some effect created by the gum.

L.

The first two series of the green postage dues were printed on NSW paper. The bottom margin was inscribed 'NEW SOUTH WALES POSTAGE'.

The third (crown over single-lined A) and fifth (shilling with stroke, same paper) series of green postage dues were printed on Australian paper inscribed at the side 'COMMONWEALTH OF AUSTRALIA POSTAGE'.

Neither of these are your stamp.

It is from the fourth series on 'Crown over double-lined A' paper where 'COMMONWEALTH OF AUSTRALIA' appeared in the top and bottom margins. This is SG D54, Scott J30.

Thank you very much ! Always a privilege to learn from you !

Indeed,
I had trouble locating it in ACSC. (D67)

Thank you rod222 !