Unlocking the entrance door of MIWA-PMK SHOWA cylinder

"Lost key, Unlocking the entrance door"

It's an old apartment building. Although it is a MIWA-PMK type, it was a cylinder with "SHOWA" engraved.This combination is new.what kind of key is it?It seems that it has been discontinued and is no longer available. Couldn't find it in a web search.

The handle type looks like WEST's rim lockACT lock. The shape of the thumbturn can be either knurled or rugby ball, but the unlocking method remains the same, so continue working.I was able to unlock it in no time.

After further investigation, I found the following. It seems to be a similar key to the MIWA UR rotary disc cylinder.

Showa high performance cylinder Mr. Home [MIWA PMK replacement product]