Set/Series
Four British bridges of historical significance, including the Tarr Steps, Aberfeldy Bridge, Menai Bridge and the M4 Viaduct

GB1526 4d British Bridges
GB1528 9d British Bridges
GB1530 1s 6d British Bridges
GB1532 1s 9d British Bridges

GB1526 Details
15 x 14 perfs; polyvinyl alcohol gum; chalk-surfaced paper; two phosphor bands applied in photogravure; designed by Andrew Restall; printed photogravure by Harrison in sheets (6 x 20); 97,458,120 copies sold

Colours & Plates/Cylinders
Cylinder numbers located in the left margin of sheets by column 1, rows 17 and 18; traffic lights in the top margin by column 5, row 1:

black–turquoise-blue–bluish violet–gold
3A–1B–2C–2D

Notes
Polyvinyl alcohol (PVA) gum replaced gum arabic on Harrison printings from this issue onwards

Varieties
GB1526GUa Printed on the gummed side
GB1526PHa Phosphor missing

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