Identification of the 1¢ large banknote
Step 2 - Look at the corner ornaments

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Easily seen on the proofs
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Less easily seen on the issued stamps
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Are the ornaments ...

DECORATED

CLEAR

The most significant difference is the shading between #206 and the rest is in the two top corners. On #206, the white balls in the top left and right corners are heavily shaded with fine lines (curls), making them almost invisible.