This is what Wikipedia has to say about it.
The Orpington is a breed of chicken named after the town of Orpington, Kent, in south-east England, which was made famous in part by this breed. It was bred to be an excellent layer with good meat quality. Its large size and soft appearance together with its rich colour and gentle contours make it very attractive, and as such its popularity has grown as a show bird rather than a utility breed. Hens often become broody and are good mothers. Although rather heavy, they are able to fly small distances but rarely do so.
The original black Orpington was bred by William Cook in 1886, he chose a black bird so that it would hide the dirt and soot of London.
I got the images for my postcard of the Internet and found that the chickens come in a variety of colours now.
I covered my postcard with a copy of an Orpington road map, I used a credit card to scrape some acrylic paint over it. I left the top right hand corner clear of paint because my road is there quite close to the station.
Thank you for looking.