Interesting Max and thanks for sharing!

Could you send samples of these three when also shipping another item for me? That would be great and like this it would be easier to tell them from each other.

I know that a German lock manufacturer called "Burg Wächter" used and I believe still uses "Antinitstahl" for the steel pins in locks (I am not certain if they still use it). Some locks even had both driver and key pins with this material. The only thing I could find out about it so far is that it was used for guns in the past and is highly corrosion resistant.

Adrian