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2006 $4.05 Priority Mail X-Plane - Catalog # 4018

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Mint Plate Block of 4
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Grading Guide
Related Products:
50 Horizontal Mounts, Black, Split-back, Pre-cut, 45 x 38 millimeters (1-3/4 x 1-1/2 inches)
25 Horizontal Strip Mounts, Black, Split-back, 215 x 38 millimeters (8-7/16 x 1-1/2 inches)

U.S. #4018
2006 $4.05 X-Plane
Priority Mail

Issue Date: March 17, 2006
City: New York, NY
Printed By: Banknote Corporation of America for Sennett Security Products
Printing Method: Lithographed with hologram
Perforations: Serpentine die cut 10 ¾ x 10 ½
Color: Multicolored
The X-15 rocket plane appears on this Priority Mail stamp. The X-planes were experimental U.S. aircraft created to test the technology of supersonic and space flight. The X-1 was the first plane to break the sound barrier (1947).

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