heavy old tricklock

This old tricklock is huge, and weighs more than half a kilogram.

It comes with only one key ... which may not seem enough at some point. Rest assured one key is enough, and no external tools are needed.

This lock was once damaged by using too much force (which did not help solving it, but instead locked the key inside, as shown in the picture).

The key was recovered and the damage was repaired, now the lock works as intended again.

In one of the last steps it does require some force to move a springloaded part, that should be treated with care.

A solution description is available afterwards on request.

There are 4 or 5 moves required to open this lock.

It measures 12 x 9 x 3 cm.