I don't like to talk about this but for almost 9 years wreck hunting almost 20,000 artifacts later those are hull sheathing and nails were used! Here are a mixture from 12 wrecks! Some had 100's of pre-1800s coins...some had none. Here are just an sample:3 Spanish 8 Reales and 1 French Ecu. No diving was done to recover any of this.