This is a 1956 United States first day cover commemorating the Alamo.
It features a Fluegel cachet on the left and four 9-cent Alamo stamps.
The postmark is from San Antonio, Texas, dated June 14, 1956.
The stamps are part of the Liberty Series, specifically Scott catalog number 1043.

Features:

• First Day of Issue Stamp Cache Envelope
• USA

Condition: Pre-Owned Good. Brown staining along the diagonal edges of the top envelope's flap. Common in older envelopes where the original gum (adhesive) has oxidized and reacted with the paper's fibers over time.