3-stamp trial plate, 1840, mauve-pink
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3-stamp trial plate, 1840, mauve-pink
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3-stamp trial plate, 1840, lilac-brown
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12-stamp trial plate, May 1840, full corners, black
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12-stamp trial plate, May 1840, blank corners, black
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12-stamp trial plate, May 1840, orange-red
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12-stamp trial plate, May 1840, dark brown
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12-stamp trial plate, June 1840, paper dipped in potassium ferrocyanide, black
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12-stamp trial plate, June 1840, paper dipped in potassium ferrocyanide, red-brown
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12-stamp trial plate, June 1840, tête-bêche, pink
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Single trial impressions
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Single trial impressions, submitted to Rowland Hill August 31, 1840
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Trial impressions annotated by Joshua Bacon, September 3, 1840
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Color selection, red, sent by Rowland Hill to Chancellor of the Exchequer, September 1, 1840
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Color selection, blue, sent by Rowland Hill to Chancellor of the Exchequer, September 1, 1840
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