Collection of WW2 German Hitler stamps on collectors card

Unusual original set of WW2 Adolf Hitler stamps on a British stamp collectors card, we estimate the card to be from the 1950s. The 10 stamps are on a display card that says "Genuine Postage Stamps, Germany. 10 Hitler Heads. 4D.

The card is in good condition, just shows signs of age. A thin layer of plastic covers and protects the stamps.