The magnesium is blackened from the grease or what ever they used to preserve them, one spot of decay. If you have an original wax or grease it, wax I think might be better. There are two versions, the earlier one has more exposed core Mle 35 ? . The aluminiun replacement would look better anodized (or corroded a tad to roughen it) to a darker grey then rubbed with black shoe polish, or something .