The S/S had 2 printings, with the 2nd printing having a slightly higher catalog value. 1st printing was for 200,000 sheets; 2nd printing for 50,000 sheets. All the first day covers are from the 1st printing.
The way to distinguish between the printings is shown below. In the picture below, look at area circled in red in the the 8c stamp of the S/S. In the 1st printing, there is a break in the background shading just below the left leg of the "n" in "Unies", resulting in a white area.
In the 2nd printing, the background shading has been retouched to remove this white area. Remember, this only applies to the S/S.
Scott UN #41-42(17Feb1956), honoring the International Communications Union. Notice again that the acronyms are different for the 3¢ and 8¢ stamps, because they are acronyms based on different languages.
Scott UN New York #53-54(Apr-May 1957), honoring the UN Emergency Force.
This is the re-engraved version of #51-#52. Compared to the earlier issue, a change in the shading produces a "halo" effect around the circles, and there is now a solid line outlining each white letter along the border.
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