I think it is pretty unarguable that the greatest period of Colt's career was the years immediately before WW1, which include Swinley, St George's Hill, Eden and all his American work, including Pine Valley. I am in awe of how he got through so much in those years, especially given that his construction model was not as fully formed as it was by the Twenties. But there is a good argument that his absolute best work was Portrush, done pretty late in his career.