This Smiler has been published with the kind permission of Margaret Sale. It is detail from a painting by Steve Williams of the Colossus computer at Bletchley Park.
The "Three Colossi" are Colossus itself, Tommy Flowers whose brilliance brought it into being in 1943 and Tony Sale. Tony dedicated a large part of his life to rebuilding the machine from the few scraps of information available. A 'colossal' task in its own right to provide such a magnificent centrepiece to any visit to Bletchley Park.
This is a bargain at this price and will hold for a short while.