MIWA WEST917(BH).LDSP Key Lost key, Unlocking the entrance door

"Lost key, Unlocking the entrance door"

It seems that he was a student, and his bag was completely lost. A person from the management company will be present.

The cylinder collar is a thin sheet metal that moves freely. Looking at the housing, there is no threaded part, so I guess it is LA type.

The unlocking process was completed with normal thumbturn unlocking, but when I looked at the carved seal on the front, it read "LDSP". The thumbturn also seemed old-fashioned. The housing of WEST917 is BH type, but I could not confirm the threaded part. It's hard to understand, the 917BH made by WEST is similar to the LA type.