I didn’t even notice that to be honest, having rechecked them, it’s a little bit of surface rust on the black lock ring, I will clean this and try rectify.
I’m guessing it’s due to having been stored in the garage for a year unused, they still have the manufactures grease on.
The rusty looking colour on the die body itself that’s actually manufactures grease.
So will require a full clean with some degreaser prior to use anyways as with any new dies.
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