Thanks for this - this was from the 50s and housed EPs before they had picture sleeves. I did not feature it as I was putting in sleeves for 7" singles. But maybe I should put this picture in a future edition just to show everyone.
Segundo a insuspeita Record Collector, esta foi a primeira company sleeve da Parlophone, tendo sido utilizada pela etiqueta britânica de 1955 a 1957 para guardar os emergentes singles em substituição dos 78 rotações.