Set/Series
Promoting Nature Week, running from 18 to 25 May, highlighting the natural history movement and wildlife conservation

GB1273 3d Nature Week
GB1274 4½d Nature Week

GB1273 Details
15 x 14 perfs; gum arabic; chalk-surfaced paper; multiple crowns watermark; no phosphor or three bands applied by photogravure; designed by Stanley Scott; printed photogravure by Harrison in sheets (6 x 20 x 2 panes); 144,704,581 non-phosphor and 8,632,921 phosphor copies sold

Colours & Plates/Cylinders
Cylinder numbers located in the bottom margin of panes by column 5, row 20:

black–brown–green–yellow
1A–3B–1C–1D (no-dot and dot panes, non-phosphor and phosphor)

The following cylinders were created and used, but there's no evidence of printings from cylinders 1B or 2B on the market:

1A (black) – 230,499,600 copies printed
1B (brown) – 2,320,320 copies printed
2B (brown) – 148,560 copies printed
3B (brown) – 228,179,280 copies printed
1C (green) – 230,370,720 copies printed
1D (yellow) – 230,359,920 copies printed

Notes
The stamp was issued both with and without phosphor.

Examples purportedly missing green, leaving the leaves and stems in a pale yellow shade, surfaced on eBay during January 2010. These were subsequently verified by the Royal Philatelic Society as being chemically treated fakes

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