This is a case made by Hardigg, now owned by Pelican, an American company who produce cases for the military and law enforcement.
As a professional photographer I have had experience of Pelican cases and in my opinion this Hardigg case is superior, it has four metal locking clasps as oppose to the plastic Pelican ones which have broken on me in the past. While it is lighter but just as strong. It also has a metal pressure valve as oppose to the Pelican plastic ones.
The case dimensions are: External, 63cm long, 47.5cm wide, 38 cm high. Internal, 56cm long, 41cm wide, 30cm high.
As you can see from the pics this case is absolutely spotless on the inside, it has had very light use with a couple of scuffs on the outside.
Price is £80 collected, can post but it would probably be around £20.
Pm me for pics as this server won't let me upload decent size files.