This puzzle won the 1st prize in the IPP Puzzle Design competition 2003, designed by R D Rose (who died many years ago).
This version is made by Bits & Pieces, from polished aluminium.
See Jerry Loo's review about it here : http://smallpuzzlecollection.blogspot.com/2011/08/six-key-mine.html
Buyer please cover the 5% PayPal fee.
UK shipping : £8. EU shipping : £20. Rest of the world : £30.
Thanks for looking