T2 is nice, is secret, is difficult to open, and is definitely a collectible lock. Let's see why.
T2 was made in 2 different version: a limited version was made out of stainless steel and thus is rarer. The only difference with both version of the lock is the material used, the solution of the way they work remain the same, of course.
A nice feature that I like with this lock is that you can opened it by unscrewing the front pannel and see the mechanism. And if you like, you can even create a plexi cover to put instead of the metal cover so that you can admire the mechanism while solving the lock.
But well, it makes it a very easy lock them. The main difficulty is that you cannot see what you're doing while trying to solve it. And even if you have feedback from the lock, well, it's difficult to solve. And you always need to pull the shackle to see if you have solved the lock as, unfortunately, the shackle does not pop up :-(
Your tools: you have a key and something like a rod. The first version of the lock had only one tool which was the key with a small rod on it's top, which gave a clue: you could only use the key or the small rod, and not both together. Whereas, with the 2 tools you now have, you can use both at the same time. You follow?
You will hear some clicks while you turn the keys inside the keyhole, and sometimes you will be blocked....and at some point you may solve it without understanding what you did :-)
The interesting thing is to open the lock to see the mechanism.
I had difficulty to open the lock and I do feel it's not easy to repeat. But obviously it's highly collectible, it's a popplock after all! Plus it's still fun to play with it. Give it a try!