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A - Grill covers the entire stamp.
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B - Grill 18 x 15 mm (22 x 18 points)
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After the letters "A" through "F" had been
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assigned the "Z" grill was discovered. Since it
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was an unknown type it was assigned the letter "Z". That letter has never been changed.
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A Ð Grill Grill all over.
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C - Grill 13 x 16 mm (16-17 x 18-21 points)
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D - Grill 12 x14 mm (15 x 17-18 points)
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Z - Grill 11 x 14 mm (13-14 x 17-18 points)
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E - Grill 11 x 13 mm (14 x 15-17 points)
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F - Grill 9 x 13 mm (11-12 x 15-17 points)
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G - Grill 9 1/2 x 9 mm (12 x 11 1/2 points)
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H - Grill 10 x 12 mm (11-13 x 14-16 points)
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I - Grill 8 1/2 x 10 mm (10-11 x 10-13 points)
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J - Grill 7 x 9 1/2 mm (10 x 12 points)
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