Mr. Ganesh Subramaniyam from Thiruvananthapuram Kerala, India, made a smallest gold code lock with a height of 3mm, a circumference of 1cm, and a weight of 41 mg. The code lock contains 3 lines of code number from 0 to 9. It sets the world record granted by the world Record Association for being the smallest gold code lock in the world.

I'd like to get this lock into my collection, but afraid it would get thrown out when I brushed up brass dust from impressioning a key!!!
Gordon
Just when you finally think you have learned it all, that is when you learn that you don't know anything yet.