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I had spent quite some time on the Anker 3800 cylinder. This system was originally patented by the Japanese firm MIWA. It contains just 4 pins, each of them having 4 possible depths. But, there’s also 4 sliders that are magnetically operated by magnets in the key. This system was sold in the Netherlands...
See my video on the Panasonic version: https://youtu.be/TJmQonKBmvQ source