This is a puzzle that I really hunted for. It just looks spectacular, and now that I own one I can also confirm that the craftsmanship is absolutely superb.
I have also decided to start using my own pictures from now on because it adds a kind of personal touch to my blog and also avoids any nasty copyright issues.
This puzzle is made by puzzle designer Wil Strijbos in the Netherlands. It is entirely milled from solid aluminium block (apart from some of the contents), which makes it absolutely impossible to open without finding the correct solution. Unless you own an angle grinder of course.
Looking at the puzzle you can see two parts which I shall call the base and the lid, and both are engraved with a two digit number. The base also has a small hole drilled through the bottom into the cylinder. Now obviously the objective is quite 'simply' to open the cylinder. As always, this is not quite as easy as it may sound.
The lid will depress very slightly and spring back up again. You can also hear rattling from the inside and the lid will rotate a full 360 degrees in either direction.
I think this puzzle took me around 2 hours to solve which I believe was partly through luck, but I have spoken to many people who have had this puzzle for months and even years and have not solved it. Plus the mechanism really is brilliant.
On top of all of this Wil is also a really nice guy to order from and chat with. I don't want to post his details here, but if you do a bit of internet hunting I'm sure you will be able to track him down. Failing that, drop me a message with your email and I might be able to help you out.
Where I got the Aluminium Cylinder from: Wil Strijbos
And now it is also available from Sloyd in Finland.
After a few comments and emails I thought it would be worth adding this info on fixing a jammed Aluminium Cylinder:
Turn it upside down, spray a decent amount of WD40 into the hole, leave for a little while. Turn it back over and drain out the excess WD40. That should get it moving again.