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Drawer with cardboard boxes and paperwork. Nothing that emits moisture.

Both scales original and same synthetic material; razor was stored with the spine facing upward. I never oil blades. I store many razors in the bathroom in a terry cloth wash mitt. No rust issues for...

If humidity would be the cause, how do you explain the fact there is so much more rust on one side?

There is a rust-colored discoloration on the scales, especially the inside. Have tried but could not smell any vinegar or camphor-like smell.

Please have a look at the pictures. i bought this razor new couple of years ago. Never used it, has been living in a dry drawer in a dry room.
As you can see one side of the blade is rusty, handle...