David
England has the most, in Scotland it's: Muirfield, St Andrews Eden, Longniddry, Peebles, St Andrews New (redesign) and a few more lesser knowns.
Tom
It looks very well preserved. I don't know the details of the design history but the yardage chart indicates that the Hawtree clan has looked after the course in recent decades. The 6th green has recently been "reconstructed" and the bunkers "remodelled". The bunkers look mostly right to my eye and consistent with other Colt courses, apart from maybe the curves looking a bit smooth. The bunkers do look old and established. I like the sand colour, it adds to the different look of the course.