I have an old Trelock padlock. It doesn’t use the 3 padlock symbol, but it says Trelock. I estimate that it was made in the 1930s due to the style and the fact it says on the back “Made in Germany.” If it was made during the Cold War period, it definately would say made in West Germany. An interesting feature of this lock is that it requires two full turns of the key to lock or unlock the padlock.
Scott
