Thomas Warren Custom Unique Coin Knife 6AL4V Titanium with Carbide Edge RARE. Chisel ground titanium blade with a carbide edge. Diameter: 1 3/8 titanium frame (just under the size of a US Half Dollar Coin).Blade steel: 6AL4V titanium w/ carbide edge. Please see pictures for further info and condition. We do not cancel or accept offers on listings - unless otherwise stated. Our auctions typically start well below retail. We feature proven products and great customer service.