Bradford Exchange Martin Luther King 16 Commemorative Proof Coin Set Two Cases. PLEASE NOTE THESE ARE SILVER PLATED AND NOT PURE OR STERLING SILVER. BRADFORD EXCHANGE CALLS THEM ?PROOF COINS?. We have included photos of the Certificates of Ownership outlining the coins are plated in 99.9% silver. Purchased as part of a larger lot of historical memorabilia and coins, pins etc. As near as we can tell, this set was issued in 2018 by The Bradford Exchange. The cases are made of a beautiful red wood and one case has the metal tag stating what it is. The second case might have had one as well but we are guessing it fell off. We are figuring someone would want them as a set so we are not going to break them up just yet. Will ship USPS with tracking to winning buyer.