Eight Welsh narrow gauge railways make up the Joint Marketing Panel. This issue was valid on the five railways which operated a Railway Letter Service: the Festiniog, Llanberis Lake, Talyllyn, Vale of Rheidol and Welshpool and Llanfair Railways.

Designer: Anthony Daffern. Printer: T. Stephenson & Sons, Prescot. Lithography in sheets of 8 (4 rows of 2). Perf.: 11. Number Printed: 8,000 of each.