Maison Martin Margiela pour H&M Enlarged Key Ring Necklace. Margiela Re-Edition H&M Keyring Necklace Chocker. Enlarged Keychain choker necklace by Maison Martin Margiela for H&M, Collaboration.The item "MMM Maison Martin Margiela pour H&M Enlarged Key Ring Necklace BNWOB VERY RARE" is in sale since Monday, November 19, 2018. This item is in the category "Jewellery & Watches\Costume Jewellery\Necklaces & Pendants". The seller is "noelle_1972" and is located in London. This item can be shipped worldwide.