c.1880 De La Rue perforation experiments on Imperial Crown w...

Hammer

£700

c.1880 De La Rue perforation experiments on Imperial Crown watermarked paper, each sheet with the printed heading "Experimental Perforations / of Watermarked paper for Postage Stamps / "Gauge" of Perforations / Diameter / Direction", completed in ink to show the perforation size (eight perf 14, four perf 15, four perf 16), hole diameter size (0.032" - 0.038") or direction of perforation (vertical or across the sheet). Watermarked vertically (7), inverted, sideways to right (6) or sideways to left (2), most with partial watermark inscriptions from the sheet edges or central gutter, 7-10 rows of perforations horizontally across each sheet, each 115-135 x 240-230mm. An unusual archival group. (16 trials).