US 1971
SAN JUAN
450th Anniversary; Sentry Box, Morro Castle, San Juan.
Commonly known as El Morro, it is a fortification built in San Juan in the 16th Century when Puerto Rico was under Spanish rule.
Water Activated Gum
Scott 1437
Perforated 11
Lower Right Stamp Mr. Zip Block of 4
Mint Never Hinged
