Keywords: Puerto Rico 8c 1971 issue.JPG en Image of U S Commemorative stamp<br> San Juan Puerto Rico was commemorated with an 8-cent stamp on its 450th anniversary issued September 12 1971 The vignette pictures a sentry box from Castillo de San Felipe del Morro San Juan was founded in 1519 and fortress construction began in 1539 First issued on September 12 1971 U S Post Office; Smithsonian National Postal Museum Bureau of Engraving and Printing; Stamp designed by Walter Brooks PD-USGov Uploaded with UploadWizard 1971 stamps |