Post Office London Outposts of Britain McKnight KaufferOriginal vintage advertising poster A postman in the pool of London Outposts of Britain. Rare large format published by the General Post Office (GPO). Great design featuring a black and white photograph of a postman on a rowing boat in London crossing the river to deliver the mail with larger shipping boats in the foreground and a crane and buildings in the distance, framed within a grey, blue and black border with stylised text below in white and