Vintage-Style #6 Air Mail Envelopes – Gummed Flap, USPS-Approved

Set of 10 vintage-style #6 ¾ Air Mail envelopes (3 5/8" x 6 ½"), made from lightweight 20 lb paper with a gummed flap closure. These envelopes are mailable through USPS with standard First-Class postage.

Commonly used for personal correspondence, pen paling, and paper crafts. Red and blue border design inspired by traditional air mail envelopes.

Specifications:
• Quantity: 10 envelopes
• Size: #6 ¾ – 3 5/8 in x 6 ½ in (9.2 cm x 16.5 cm)
• Paper weight: 20 lb
• Gummed flap closure
• Mailable via USPS with regular postage

Note on Airmail History:
Airmail began in 1918 and was used domestically until 1977. As a separate class of international mail, it ended in 2007. The design remains a recognizable symbol of global correspondence.