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I've had these silver bricks for years at least since the mid to late 2000s when I got them from Legoland Windsor when they where clearing out old and unsold stock.
I couldn't find any reference to them on Bricklink and I believe that they where made as a one off commission which was the cockpit of a Boeing 747 that was around the size of a small van and Legoland was simply selling off the surplus.