Whites Spectrum XLT, Garrett AT Pro, Macro pinpointer, Garrett carrot pinpointer,
Lesch digger, Nel Tornado coil for ATPro, Garret ATMax with Nel Tornado coil
My guess would be that it was tumbled with copper pennies by mistake. When I tumble my clad that I dig, occasionally I screw up and let a copper penny in with the clad coins and the whole bunch has a nice copper look to them.