SHOWA 516.NX, Lost key of rim lock, Unlocking the entrance door

"Lost key, Unlocking the entrance door"

This type of door lock is quite rare.It seems that there are still some in the old property, but it's been a long time since I encountered it over 5 years ago.

This unlocking process is troublesome and cannot be unlocked immediately. Moreover, this time the intercom attached directly to the door will get in the way.

Normally, you can't see it with a camera tool, and it's difficult to transmit force, but I was able to unlock it after about 15 minutes of searching. In the early days, it was the "516 type" that could not be unlocked.