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Date of Issue - October 1, 1998
Place of Issue - Florida Space Center, Florida
Print Quantity - 185,000,000 stamps
Colors - Magenta, Yellow, Cyan, Black
Plate Numbers - "S" followed by five (5) single digits

Space Shuttle astronaut Dr. Don Thompson and Jim Jennings, Deputy Director for Business Operations at the John F. Kennedy Space Center, joined Karla Corcoran, the Postal Service's Inspector General, to dedicate the stamps on October 1 at the Kennedy Space Center in Cape Canaveral, Fla. Hundreds of local school children attended the event which officially kickoffed NASA's 40th anniversary activities.

These stamps include the feature of hidden images within the stamp itself.
3238 - Space City - Hidden images of large spacecraft, small spacecraft, and figure.
3239 - Space Ship Landing - Hidden image of small spacecraft.
3240 - Person in Space Suit - Hidden image of small spacecraft.
3241 - Space Ship Ascending - Hidden image of small spacecraft.
3242 - Large Domed Structure - Hidden image of small and large spacecrafts.

To view the hidden images, one must use a special acrylic decoder lens, which the Postal Service sells for $4.95 through its Stamp Fulfillment Services division. The added feature of hidden images is used by the Postal Service as both a bonus for stamp collectors and as an added security feature.

United States Space Stamps