This is Rainer Popp's T13 lock. The lock weighs over 2 kgs.
Shipping: £15 in the UK; £30 in the EU; £45 Rest of world.
Description
T13 was inspired by Henry Isham’s Permutation Lock which he invented in 1845. It has some features that I am quite proud that I was able to implement. The lock has 13 steps to open, according to the solution.