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The Postal Store®

#9 Window Stamped Security Envelopes (Pack of 5, PSA)

$4.75
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The U.S. Postal Service® celebrates a favorite backyard bird with the issuance of the Forever #9 Barn Swallow Window Stamped Security Envelope with (PSA) pressure-sensitive adhesive.

Size: 8.875"(W) x 3.875"(H)
SKU: 291005
PSA: Pressure Sensitive Adhesive

Collect all six issuances from the 2026 World Expo

Browse the Boston 2026 World Stamp Show Keepsake!