This postcard was photographed and published by Marshall Keene & Co,
who had works at Hove Sussex.
When was the card published? It was posted in 1961, but may well
have been published a couple of decades earlier.
The card has a serial number below the picture on the front: 34309.
This suggests that the company may have published a wide range of cards,
but the one above is the only only one that I have seen.
I have found one other card by the same publisher on the
internet, numbered 32044 and dated 1942