Each part of the Hatch, except for the stainless-steel clip and rollerball refill, is made of solid brass.

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The hardware, which ships on a pallet, includes 4-foot-high steel boxes with a built-in desk that sports a rubberized keyboard and rollerball mouse.

ENGADGET: What's Past is Prologue: a look inside the future of Lockheed Martin

It tells how agents write their message using a Pentel Rollerball, then press it against a fresh piece of paper to transfer an invisible message.

BBC: Spy tactics revealed by book

Mr McTiernan was originally accused of lying about hiring former celebrity private investigator Anthony Pellicano to wiretap film producer, Chuck Roven, after they both worked on the movie Rollerball.

BBC: Die Hard director John McTiernan heading to prison