The Iranian FDC has one main cachet, but with all kind of different imprints. There is no way to find out which one is the rarest or not. The first one shown is however the most common:
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FDC type 1: RED Particularities: only cover with red imprint below Expo Logo, most common to be found, the word COMMEMORATING seems to increase in height near to the end.
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FDC type 1: RED shifted print Particularities: see previous
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FDC type 2a: BLUE Particularities: FIRST DAY COVER mentioned above the Expo 58 logo, mistake in the word: COEMMMMORATING, bold text
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FDC type 2b: BLUE Particularities: COMMEMORATING correctly spelled, double print of the third M in the word COMMEMORATING, most common to be found, dark blue
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FDC type 2c: BLUE Particularities: same as 2c but brighter blue, 4th line of text has been added.
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FDC type 2d: BLUE Particularities: same as 2c but darker blue and with the imprint of FIRST DAY COVER in the logo, the distance is longer between 17 April 1958 and the remaining of the line
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There are also some FDC to be found with the famous Rodan cachet, similar can be found with other color combinations:
