Two of the stamps, shown here as PHQ stamp cards, in a set of 10 to commemorate the opening of the London Underground, the oldest underground transportation system in the world. They were issued last Wednesday, 9 January, the exact date of the opening of the first line. The general public was admitted the following day.
The full set traces the development of the Underground and also shows some poster art. There are in fact 11 PHQ cards because the eleventh shows the mini-sheet. Altogether too many for one post. Sadly, not all the designs are available as individual stamps.
This is a post for Sunday Stamps, now hosted by Violet Sky at "See it on a Postcard!"