This is a Conway Stewart 759 set in blue marble. I’ve written about the 759 set before; you’ll see it here: http://wp.me/p17T6K-VV. I won’t repeat all that. Suffice it to say that this set seems to have been used remarkably little. The pencil still contains all the spare leads it was issued with.

Conway Stewart boxes are in a class of their own. A few are in Art Deco style but most are just in pleasant patterns that don’t adhere to any particular artistic period or style. This one is a particularly nice example. Perhaps it has faded a little over the years but it is still immensely appealing.