A special pictorial cancellation will be available through Houston's main general post office (GPO) on Franklin Street for all mailed-in requests to commemorate the 50th anniversary of Mercury-Redstone 3, the first American manned spaceflight by Alan Shepard, on May 5, 1961.
Once available, requests should mailed to the address below with proper postage affixed (44 cents for covers; 28 cents for postcards; or 98 cents First Class International) and it is recommended that stamped return addressed return outer envelopes or packaging is provided by the sender.
First American in Space 50th Anniversary Station
c/o Postmaster
USPS GPO
401 Franklin Street
Houston, Texas 77201-9998