Duckworth studied the Large Queen issue and the papers on which they were printed. He categorized them into a number of types based upon their mesh, weight, color, opacity, etc. Some papers were used to print all of the denominations, some a few of the denominations (e.g. the laid paper) some just one (the Pirie watermarked paper).
Papers are known by their "Duckworth types"
Here's a page from my collection that can complement the link to the scans from the Duckworth Large Queen Book. I keep them as reference copies for the different papers.
C.
