official First Day Cover (FDC) issued by the British Royal Mail on February 2, 1977, in London, titled "New Definitive Values" to mark the release of updated postal tariff rates.
The envelope features a single 50p (pence) gold-olive definitive stamp showing the side profile silhouette of Queen Elizabeth II (the famous Machin design).
It is officially stamped with a circular "First Day of Issue" cancellation postmark from the London, S.W. post office.
